[Editor’s Note: This article originally appeared in the February 2015 issue of Grassroots Motorsports.]
We’ve all seen them: big, lumbering behemoths. They groan and wrestle and sway, desperately clinging to what little stability they have.
No, we’re not speaking about obese canine or somebody’s pet hippo. We’re speaking about harmful truck-and-trailer combos, and anyone who’s walked the paddock at an novice race monitor …
Explorer or Exploder?
There’s just one approach to really convey what can occur when towing goes incorrect: Tow improperly, then present gratuitous footage and video of the aftermath.
With this mission in thoughts, we wanted a tow car, a trailer and a automobile to tow. This meant deciding what kind of towing setup we might use. Most of us don’t use an 18-wheeler to get our automobile to the monitor, however many gearheads do have rigs which are a bit extra heavy-duty than the aforementioned sedan.
We determined {that a} midsize SUV and an open trailer could be consultant of the common fanatic’s tow rig.
We fired off an e-mail to a producer of premium European driving machines.
Their SUV could be an ideal selection, we reasoned, and its glorious rollover score assured us that our take a look at driver would stay to tow one other day. They’d be idiots to not allow us to borrow (and probably destroy) one among their fashionable SUVs, so we had been assured they’d say sure.
And, surprisingly, the corporate replied the very subsequent day. Their reply? “Whereas we’d welcome publicity in your publications for the unheralded towing capabilities of the [SUV], this doesn’t really feel like the precise match, so we’re going to cross on this one.”
Darn, and we had been certain that may work. On to Plan B: Roam Craigslist with a wad of money and a blatant disregard for good sense. We launched into a marathon Craigslist search, three SUVs in a single night time. By 11 p.m., we’d bought our take a look at mule, a 1997 Ford Explorer.
It had bald tires, a cockroach infestation, and a smattering of bent sheet metallic and damaged inside elements. A brand new European SUV it wasn’t, nevertheless it was mechanically sound. Plus, it got here with the stigma of being a Ford Explorer–good for a take a look at involving evasive driving maneuvers and many weight on the rear tires.
We stripped the inside and put in a roll cage, race seat, trailer hitch and digital brake controller. Issues had been about to get fascinating.
Trailer Time
Subsequent, we wanted a trailer. Luckily, Greatest Value Trailers is situated throughout the road from the GRM places of work. Robin Hanger discovered the proper one for us: an 18-footlong, dual-axle, all-steel mannequin. Weighing in at 2100 kilos, it was good, if not a bit overkill, for the common membership racer. We promised to convey again no matter remained of the trailer after our take a look at.
The Ending Contact
With a truck and trailer procured, it was time for the ultimate piece of our 12-wheeled puzzle: a trailer weight.
Our Explorer was rated to tow 6200 kilos, and naturally we needed to load it to its restrict. So, we wanted a roughly 4000-pound object to strap down on the trailer. Bonus factors if it was vaguely carshaped– in spite of everything, few folks tow cubes of result in the monitor each weekend. After rummaging round in our backyards, we discovered the reply: a 1985 Mercedes-Benz 420SEL that was initially bought as a elements automobile.
It was, in a single phrase, good. 4 wheels? Test. Automotive-shaped? Test. Weighs practically 4000 kilos? Test. After a number of hours of coaxing with two vehicles and a winch, we managed to get the Mercedes strapped onto the trailer.
Check Monitor
Every single day, folks have harmful crashes whereas towing trailers on public roads. Although it could have been low cost and simple, we determined that the freeway in all probability wasn’t the very best place to push our rig to its limits. As an alternative, we conned the attractive Florida Worldwide Rally & Motorsport Park in Starke, Florida, into letting us crash on their property.
They had been even type sufficient to allow us to borrow their chief teacher, Bryn Walters, who bravely volunteered to play the position of take a look at driver. Lastly, we had been able to see what occurs when towing goes incorrect.
TEST 1: Baseline
A drive by our take a look at course and not using a trailer.
When the morning of the take a look at got here round, we strapped Bryn into the Explorer’s Extremely Defend seat and despatched him out for take a look at primary: a baseline run with out something hooked to the truck.
To measure the rig’s efficiency, we put collectively a take a look at monitor that mimicked the worst stretch we’d encountered whereas towing a trailer on public roads: two hairpin turns with a straight and a bit of esses between them. Lastly, there was a panic cease from 50 mph.
After laying down a number of laps to get snug, Bryn reached a verdict: “Nicely, it’s a truck. Nothing actual thrilling right here.”
TEST 2: Loaded Trailer
Towing a correctly loaded trailer.
Now that we knew what a inventory Explorer may do, it was time to hook up the trailer. We needed to see how a lot the driving dynamics modified simply by including a accurately configured towing load.
So, we connected the loaded trailer and despatched Bryn out for one more spherical of checks. The Explorerand- trailer mixture was slower to react and took longer to cease, nevertheless it usually drove such as you’d count on a small truck towing an enormous automobile to drive. Bryn once more reported no surprises.
TEST 3: No Trailer Brakes
Towing with out trailer brakes.
It was time to begin turning up the knobs, so we began with the most typical towing sin we’ve seen within the paddock: damaged or lacking trailer brake programs.
As soon as a loaded trailer reaches a sure weight (3000 kilos in most states), it’s legally required to have trailer brakes. The commonest type of trailer brakes are electromagnetic drums which are actuated by a trailer brake controller within the tow car. These easy gadgets use an accelerometer to step by step apply the trailer brakes when the tow car slows.
With all this in thoughts, we unplugged the trailer brakes and wished Bryn good luck. Then we discovered a sturdy Jersey barrier to face behind.
Bryn dealt with the Explorer properly, although it was clear that trailer brakes do make a distinction. His stopping distance was far longer–186 toes versus the 174- foot baseline. Moreover, he stated the trailer acted like a pendulum underneath heavy braking, making an attempt to push by the stopping truck.
Whereas slowing the truck-and-trailer mixture appeared like an train in puckering, Bryn managed it like a champ. He additionally praised the Explorer’s ABS, saying it was an enormous assist in stopping the trailer from pushing the truck round an excessive amount of. Sadly, he hadn’t but wrecked.
TEST 4: Excessive Tongue Weight
Towing with the automobile too far ahead.
Bryn, the Explorer and the trailer had proven that they might deal with a bit adversity, so we connected the brakes once more and tried one thing a bit extra excessive. We pushed the Mercedes all the way in which to the entrance of the trailer, bottoming out the Explorer’s suspension and making the hitch groan and bend.
This specific setup might have been a bit extreme, however having an excessive amount of weight on the tongue of a trailer is an exceedingly frequent mistake. It could possibly overload the rear of a car, inflicting unpredictable dealing with and lessening the impact of any steering inputs. We’re fairly certain we noticed the entrance wheels of our Explorer depart the bottom at one level, and Bryn described this mixture as “wobbly, like a canine wagging its tail.”
Sadly, skilled rally instructors are fairly good drivers, so this take a look at didn’t produce very spectacular penalties. Bryn’s lap occasions and stopping distances didn’t change a lot–keep in mind, he’s a skilled skilled–however he says that the pucker issue had gone up tremendously. Until you take pleasure in seeing air underneath your entrance tires, we recommend limiting your trailer’s tongue weight. Purpose for 10 to fifteen p.c of the whole trailer weight.
TEST 5: Excessive Tail Weight
Towing with the automobile too far rearward.
At this level, the Explorer’s hitch appeared sufficiently exasperated from being dragged alongside the bottom, so we backed up the Mercedes–quite a bit–till it was practically falling off the rear of the trailer. Now, as a substitute of getting greater than a thousand kilos of tongue weight, we had none in any respect. In truth, the trailer was truly lifting the again of the truck.
Anybody who’s ever towed a rear-engined automobile that’s pointing ahead is aware of this sensation. We additionally should admit that towing a Porsche 911 with a minivan practically price us our lives a few years in the past.
Luckily, we weren’t within the driver’s seat this time–Bryn was. We despatched him out on monitor and returned to our favourite Jersey barrier.
And wow, had been we ever glad there was concrete between us and our creation. Bryn didn’t mince phrases after these runs: “There’s just one phrase for that: evil!” Even from exterior the rig, we may see he wasn’t having any enjoyable. The Explorer tried to spin with each flip, and Bryn was basically drifting by the curvy a part of the course.
As soon as he lastly received to the straight, he floored it– solely to spin the tires on the SUV’s barely weighted rear. At full velocity–on this case about 45 mph–the entire truck-and-trailer mixture slithered like a snake, sliding rhythmically throughout the pavement. Sadly for Bryn, the truck’s rhythm was at all times out of sync with the esses, that means he needed to sluggish considerably and principally idle by them.
TEST 6: Flat Tires
Towing with poorly inflated tires.
We had been beginning to understand that you could get away with virtually any towing sin if you happen to’re a professional rally driver, so we referred to as in Bryn, moved the Mercedes to its correct place on the trailer, and flattened all of the tires. Critically? Sure, severely.
We needed carnage, and correctly inflated tires had been standing in our manner. Each tire–on each the Explorer and the trailer–was lowered to fifteen psi. We figured that was the bottom strain the common human would see and nonetheless suppose, “Eh, that tire’s not flat. It’ll be tremendous.”
Whereas we had been letting out the air, we realized that a number of of the Explorer’s tires had large bulges within the sidewalls. These are often indicative of imminent failure, so we smiled, wished Bryn properly, and despatched him out for one more spherical of checks.
Driving, by no means thoughts towing, with delicate tires is a recipe for catastrophe: In addition to the discount in management and poor dealing with, low tires are likely to overheat on the freeway, and many warmth is a typical reason behind blowouts.
Annoyingly, Bryn appeared to have that lack of management underneath, properly, management. He did begin clicking off laps that had been slower than traditional, although–by about 2 seconds per lap–and he was working a lot tougher than earlier than. “Mushy and unsure” is how he described this session.
The rig was working extra, too. Every time it went by the esses, the trailer tires deflected from one excessive to the opposite–determine greater than 4 inches complete.
No blowout, although, because the tires stayed mounted on the edges. Don’t overlook, our rig and trailer solely needed to deal with a number of laps at a time, not hours on the interstate. We had been going to should strive one thing extra drastic as a way to get our cash’s value from that roll cage.
TEST 7: No Shocks, Automotive on Backward
Towing with out rear dampers and with the automobile going through backward on the trailer.
Okay, time to recreate some horrors–all within the identify of science, proper? We disconnected the rear dampers and put the automobile on the trailer backward. Don’t fear if you happen to’ve accomplished this earlier than. We’re not right here to cross judgment.
Bryn’s subsequent few laps confirmed our suspicions. He returned sporting a full mane of white hair and babbled one thing about seeing scary issues.
Bryn, knowledgeable, was capable of maintain the rig on the course–simply barely–however he led the dance for a restricted variety of laps. May he have survived 7 hours on the interstate? Unlikely.
TEST 8: No Tie-Downs
Towing with out the automobile strapped down.
At this level, it was getting late and we had been getting uninterested in Bryn’s competence, so we threw him a curveball. Low cost tie-downs, the type most individuals tow with, break on a regular basis. To simulate this situation, we merely eliminated all of the straps holding the Mercedes to the trailer. Oh, and as a substitute of driving our regular take a look at loop, we advised Bryn to make use of the bumpy gravel that lined the surface of the monitor.
One in all us might need yelled, “Thrash it like a rented Hyundai!” Hey, it was the warmth of the second–lower us some slack.
We had been anticipating greatness from this take a look at, and we weren’t disillusioned. The Mercedes galloped into the air like a mighty thoroughbred, then got here crashing down on the trailer’s left fender like a sumo wrestler. This pushed the fender into the trailer’s tires, and plumes of white smoke rapidly enveloped the Benz.
Bryn stored driving, the truck and trailer now fishtailing within the gravel. The Explorer appeared consistently on the verge of doing a barrel roll, and the run solely ended when Bryn finally misplaced management and the rig jackknifed.
Jackknifing a trailer carrying an unsecured automobile isn’t precisely a mild expertise. The Mercedes stored shifting lengthy after the truck had stopped, lastly coming to relaxation within the Explorer’s left-rear quarter panel.
Lastly, we’d seen the disastrous penalties of improper towing. We extricated Bryn from the creaking, smoking pile of equipment, thanked him for a job properly accomplished, and began the cleanup course of.
Generally Towing Goes Improper
So what did we be taught? Like most issues involving a automobile, towing one safely comes all the way down to being a talented, alert driver.
Bryn was capable of get away with homicide on the tools aspect of issues due to his driving ability. Nonetheless, most of us will not be skilled driving instructors, and none of us tow our automobiles to the monitor on, properly, a monitor. We tow on public roads stuffed with awful drivers.
As these checks confirmed, a subpar trailer places far more pressure on the motive force. Add in a single sudden situation, and that marginal rig may rapidly find yourself in a ditch–or worse.
Towing Takeaways
Tongue weight must be 10 to fifteen p.c of your complete trailer weight–no roughly. If 10 p.c of the trailer’s weight exceeds the tongue weight score on your tow car, don’t tow with that car.
Trailers are pretty easy machines, so there’s no excuse for not sustaining them.
Don’t have time to take care of your trailer? Simply pay any person–trailer repairs are priced far under Ferrari repairs. What’s worse, a $100 trailer restore invoice or inflicting a “CHiPs” accident?
If one thing does go incorrect, be light and gradual along with your driving inputs. Usually the very best answer is to come back to a gradual cease.
When unsure, add redundancy. This goes for wheels, straps, security gadgets and so forth. All the time use a minimum of two tie-downs on every finish of the towed automobile. We favor Mac’s.
For those who can’t determine one thing out, name knowledgeable like Greatest Value Trailers. Sellers are often pleased to assist, even if you happen to didn’t purchase a trailer from them.