By Grizzly Trailer Sales | Trailer Buying Guides | Serving Rupert & Montpelier, ID
Whether you’re moving a project car to a new shop, hauling a race vehicle to a track day, or transporting a classic across Idaho to a summer show, a car hauler makes the job cleaner and safer than towing on a dolly or hiring a flatbed service every time. The process of loading, securing, and towing a car hauler is not complicated, but there are enough variables that first-timers tend to learn a few things the hard way. At Grizzly Trailer Sales, we carry bumper-pull car haulers from Dutton and Snake River that fit a wide range of vehicles and tow setups. This guide covers what you need to know before your first trip.
Choosing the Right Car Hauler Size
Car haulers are not one-size-fits-all, and the two dimensions that matter most are deck length and GVWR. Get either wrong and you’re either hanging a bumper off the end of the trailer or running a rig that’s overloaded on paper and in practice.
Deck Length
A standard passenger car, including most sedans, coupes, and muscle cars, fits comfortably on an 18-foot deck. If you’re hauling a longer vehicle, a lifted truck, or two vehicles at once, you need more length. Many buyers in the motorsports and collector car space settle on 20 to 24 feet to give themselves flexibility. A trailer that’s slightly longer than you need on any given trip is easier to manage than one that’s too short.
Width matters too, though most car haulers are built at 82 to 83 inches of deck width, which accommodates standard vehicle track widths without issue. Wide-body builds, sprint cars, or anything with flared fenders should be measured before you assume it fits.
GVWR and Payload
Most passenger cars fall between 3,000 and 4,500 lbs. A bumper-pull car hauler in the 7,000 lb GVWR range, which is among the most common configurations sold, typically carries a payload of around 4,700 to 5,200 lbs after accounting for the trailer’s own weight. That covers a single car with room to spare.
Where buyers get into trouble is hauling trucks, SUVs, or multiple vehicles. A full-size truck can weigh 5,500 to 7,000 lbs. Moving one on a 7,000 lb GVWR trailer isn’t legal or safe. If your use case includes heavier or multiple vehicles, step up to a trailer in the 9,900 to 14,000 lb GVWR range, which puts you in tandem axle territory with the payload to match.
Preparing the Trailer Before You Load
A quick pre-load check takes five minutes and prevents most of the problems that happen on the road.
Check tire pressure on all trailer tires. Underinflated tires on a loaded car hauler generate heat and are a leading cause of trailer tire blowouts. The correct pressure is listed on the tire sidewall or the trailer’s placard, not your truck’s door jamb sticker, which reflects tow vehicle tires only.
Inspect the coupler and verify it’s locked over the ball. The most reliable way is to try to lift the coupler off the ball by hand after you’ve latched it. If it comes up, it wasn’t seated. Connect the safety chains in a crossed X pattern under the tongue so they catch the coupler if it separates, without dragging on the ground during normal towing.
Plug in the trailer wiring and walk around with someone pressing the brakes and running the turn signals. Every light needs to work. Idaho law requires functioning brake lights, turn signals, and running lights on any trailer, and an officer who spots a trailer with dead lights will stop you regardless of how short the trip is.
Loading the Vehicle Correctly
Position the trailer on ground that’s as level as you can find. Loading on a slope changes the approach angle and how the vehicle sits on the deck, and it makes securing the load more complicated. A slight downgrade toward the trailer helps with ramp approach. Anything steeper than that starts creating problems.
Drive the vehicle on slowly and center it on the deck laterally. An off-center load creates side-to-side imbalance during towing, which becomes more noticeable at highway speeds and in crosswind conditions. Once the vehicle is in position, set the parking brake and leave it in gear or in park before you step away from the wheel.
Weight Distribution on the Deck
Roughly 60 percent of the loaded vehicle’s weight should sit forward of the trailer axles. This creates the correct tongue weight on the hitch, which keeps the trailer tracking straight and prevents the sway that develops when too much weight sits behind the axles.
On a single-car hauler, you control this by how far forward or back the vehicle sits on the deck. On longer trailers carrying two vehicles, position the heavier vehicle forward. If you’re hauling one vehicle and have gear in the tow vehicle’s bed, keep it forward of the rear axle there too. Weight stacked at the back of a tow vehicle while pulling a trailer amplifies instability rather than correcting it.
Securing the Vehicle: Straps, Chains, and Wheel Nets
Open car haulers typically use ratchet straps attached to tie-down loops on the trailer deck. The question of where to attach on the vehicle is where a lot of people get it wrong.
Attach straps to the vehicle’s designated tie-down points whenever they exist. Most modern vehicles have them built into the frame or subframe and listed in the owner’s manual. On older vehicles without labeled points, attach to solid frame components, not to suspension parts, steering components, exhaust, or body panels. A strap attached to a control arm or a sway bar link will either pull the part off or tear through the attachment point under load.
Four-point tie-down is the standard for car transport: two straps at the front pulling forward and outward, two at the rear pulling rearward and outward. The angles matter. Straps that run straight down without any fore or aft angle don’t resist forward and backward movement effectively during braking and acceleration.
Wheel nets are an alternative that attaches to the wheel and tire assembly rather than to the vehicle’s frame. They’re popular with collectors who don’t want straps contacting painted or finished surfaces. They’re effective when used correctly and rated for the vehicle weight. Use the manufacturer’s instructions for placement, because a wheel net that slips off the tire under load provides no restraint at all.
On the Road: Speed, Stops, and What to Check
The first stop after loading should be about five miles down the road. Pull over somewhere safe, walk around the trailer, and check that straps haven’t loosened and the load hasn’t shifted. Straps stretch slightly under the initial tension of a moving load, and catching that early costs you five minutes instead of a roadside incident.
Keep your speed at or below 65 mph with a loaded car hauler. Trailer sway typically initiates above that threshold when it’s going to develop, and a sway event with a car on the deck is considerably more serious than sway with a light utility load. If you feel the trailer begin to oscillate, ease off the throttle gradually without braking hard, and let the speed come down until the sway settles.
Idaho’s mountain passes and canyon roads present grades that change trailer behavior. Downhill sections put more stress on the tow vehicle’s braking system. If your trailer has electric brakes, which most car haulers above 3,500 lbs GVWR should, verify the brake controller is adjusted correctly before a mountain route. A controller set too light means the trailer isn’t contributing to stopping. Too aggressive and the trailer wheels lock prematurely.
Browse Car Haulers at Grizzly Trailer Sales
Knowing your vehicle’s weight, your tow vehicle’s capacity, and the basic loading and securing process puts you well ahead of most first-time car hauler buyers. The trailer itself is the straightforward part once those variables are understood.
Grizzly Trailer Sales carries bumper-pull car haulers from Dutton and Snake River at both our Rupert and Montpelier locations, with options across different deck lengths and GVWR ratings. If you’re hauling a single daily driver, a race car, or a classic that’s spent years in a garage, we can help you find the right size and configuration. Stop by either location, check current inventory online, or call our Rupert office at 208-678-2981. Bring your vehicle’s weight and your tow vehicle’s rated capacity if you have them, and we’ll work through the match from there.
