What keeps a vehicle from sliding on a rollback deck once the winch has pulled it up? Front and rear tiedowns to the deck, plus both wheel straps on the wheel-lift towbar. The winch cable is not on that list. Everything below comes from the operation and safety manual for the Jerr-Dan 7.5-ton medium-duty carrier series, document 5376000236 Rev B, and applies to that covered carrier and its fitted components; chassis ratings and state or local rules sit outside it and get handled on their own.
Buyers read the winch rating first, because it is the biggest number on the page. The number that decides whether a car stays put is not printed anywhere.
What Actually Holds a Vehicle on the Deck?
The manual's instruction is blunt: secure the equipment to the deck at both the front and the rear before the vehicle is driven. Read that as a definition. Securement is not a device you buy; it is a system of front attachment, rear attachment, and the deck structure carrying both, working against a load that wants to walk forward under braking and sideways through a turn.
A rollback carries the whole vehicle on the deck. No axle hangs off the back, and the tires sit on the deck surface. That configuration is what makes the tiedown question answerable: a flat surface, four tires on it, and structure at both ends to pull against.
So the first thing to count on any truck is anchor points at the rear. Are there any, and can a strap reach them from a bumper? A deck fitted with front anchors only is half a securement system, whatever the winch says.
Why the Winch Alone Never Counts as Securement
If the winch dragged the car up the deck, why can't it be the thing that holds it there? Because a winch is a pulling device with a brake, and a brake holding tension along one line is not the same as a car strapped down at the front and rear. The manual states the rule without hedging: never rely on the winch as the only means of holding the load.
The drum rule explains how the manufacturer treats that cable. Keep a minimum of five wraps of wire rope or cable on the winch drum at all times, and keep the wrap uniform so the rope does not crush itself. That governs the winch as a winch: enough rope on the drum to spool and grip correctly. It is not a statement that the cable is a tiedown.
Consider what a single cable line can do. It resists movement along its own direction. A car that shifts sideways, or rocks on its suspension as the truck crosses a driveway, loads that cable in directions it was never routed for. Straps pulling at the front and rear work against those directions; one hook at one end does not.
Deck Carry or Towbar — Which Setup Is This?
Which attachment points belong to deck carry, and which belong to the wheel-lift towbar bolted to the same truck? They are two separate securement paths with separate limits, and the manual does not let them blur.
On the towbar path, always use both wheel straps on the wheel-lift towbar, and never exceed the towbar ratings. The manual also bars using the towbar without a load on the deck. That last one catches people who treat the wheel lift as a free extra: it is not a standalone way to move a car with an empty deck behind it.
For car-only work the deck carry is usually the more useful setup, and it is where I would put the money first. You restrain a whole vehicle on a flat surface instead of lifting one axle and trusting two straps around the tires. What you give up is rear deck space and a set of components with their own rating limits, which on car-only work mostly sit idle.
Where Straps and Chains Attach at Each End
Where do the straps land on the vehicle? The hardware end is settled: attach the wire rope or cable to the equipment with V-straps or hook-up chains, not a bare hook dropped into a slot in the unibody.
The other end is the vehicle's problem, not the truck's. Correct tie-down attachment points come from the equipment manufacturer's own manual, which is a different book from the one bolted to the deck. That distinction matters when you are loading a car you have never hauled: the tow truck manual tells you what to use on the truck side, and the car's manual tells you where the car will take the load.
Walk the truck before you drive it and ask a few unglamorous questions. Are there rear anchor points within reach of the deck's rear end? Are the V-straps and hook-up chains on the truck, or did they walk off last month? Does the wheel lift have both straps on the towbar? And can you name the tie-down points on the vehicle in front of you without guessing?
Does Load Placement Change How Hard the Tiedowns Work?
Does where the weight sits on the deck change how much work the straps have to do? It does, and the manual treats placement as part of securement rather than a separate topic. Place the load evenly on the deck. Do not concentrate it on one section, and do not put it to the rear of the truck axles.
The reason is chassis mechanics, not strap marketing. Weight sitting behind the rear axle line unloads the steering axle, and the manual names the consequence in plain terms: overloading can cause unsafe steering and braking conditions. Straps cannot repair a weight distribution problem. They can only hold a vehicle the truck is already carrying properly, which is why placement comes before hardware.
Load the heavy end forward for the best weight distribution. On most passenger cars that means the engine end toward the cab. On something rear-heavy it does not, and you want to know which before the deck goes down rather than after the straps are tight.
What a Buyer Should Verify Before Trusting the Spec
Suppose you are looking at a used medium-duty carrier with a big winch on the nose, a clean deck, and nothing visible at the rear end. What are you buying? On the manual's terms, a loading machine; whether it can haul depends on hardware the listing does not show.
The questions to put to the seller are the same ones you would ask standing on the deck. Does the unit have front and rear deck attachment points, and are they intact? Are the straps and chains included, or priced separately? Does the wheel lift carry both wheel straps? Is the winch drum condition documented, including how much rope is left on it? And does the paperwork include the manual covering that specific carrier, so the ratings stay tied to the model instead of a category claim? Chassis ratings and state or local rules are separate conversations, and no manual settles them.
A deck-carry setup with proper anchor points and real strap hardware buys you a load you can inspect and confirm before you pull out: tiedowns at both ends, hardware you can see, a distribution rule you can check. It costs deck length, extra hardware and a few minutes on every load. Skip the rear tie-down and you get those minutes back, and that saved time is exactly what you are trusting instead of a tiedown.