Auto Hauling Strap Buying Guide
Auto Hauling Strap Buying Guide
Choosing the right auto hauling strap is not just a matter of preference — it is a federal compliance requirement. Under DOT 49 CFR Part 393.102, every vehicle transported on a flatbed or open carrier must be secured with a minimum of four tie-down points, each rated to at least one-fifth of the vehicle’s gross weight. This guide walks you through every strap type, hook option, and working load rating so you secure vehicles correctly the first time.
Step 1: Choose Your Strap Type by Application
Over-Wheel Straps (Most Common)
Over-wheel straps loop over the tire and attach to the trailer deck at three points — two at the front corners of the tire and one at the rear. This is the DOT-approved 3-point over-wheel tie-down method and is the standard for car haulers, roll-back beds, and enclosed auto transporters. Each over-wheel assembly counts as one tie-down unit under 49 CFR Part 393.
Best for: passenger cars, SUVs, light trucks
Axle Straps
Axle straps wrap around the axle housing and secure to the trailer. They are preferred when wheel contact is not possible — low-profile vehicles, exotic cars with wide fenders, or vehicles with damaged wheels. Most axle straps use a J hook or RTJ cluster hook at each end to connect to the trailer anchor.
Best for: exotic and low-clearance vehicles, inoperable vehicles
V-Bridle Straps
A V-bridle strap splits into a Y-shape that straddles the axle from two anchor points and meets at a single hook. Widely used on open car carriers with multiple decks. The V-configuration distributes load symmetrically and reduces lateral movement during transport.
Best for: open car carriers, multi-deck auto transport trailers
Lasso Straps
Lasso straps feature an adjustable loop that cinches around the tire without requiring a hook on the vehicle. Common on wheel-lift tow trucks and car dollies.
Best for: tow dollies, wheel-lift applications, quick-deployment scenarios
Tow Dolly Basket and Wheel Net Straps
Basket straps and wheel nets cradle the tire from underneath and along the sides. Used with tow dollies to secure the drive wheels of a front-wheel-drive vehicle being towed.
Best for: tow dolly front-wheel capture
Step 2: Select the Right Hook Type
Wire Hooks
The most common hook on auto hauling straps. A simple bent-wire J shape that slots into trailer track anchors. Wire hooks are lightweight and economical. Limitation: wire hooks can rotate in the anchor slot, introducing slack if not monitored.
Swivel J Hooks
A forged steel J hook mounted on a swivel base. The swivel allows the hook to self-align in the anchor slot regardless of strap angle, eliminating the rotation problem of wire hooks. Standard on professional-grade auto hauling straps.
RTJ Cluster Hooks
The RTJ (Round-Tie-J) cluster hook combines three hook profiles in one forged body — a round hook, a tie-down hook, and a J hook. This allows the same strap to connect to virtually any anchor type: E-track, A-track, rail slots, and standard rub rail. RTJ hooks are the universal option and standard on GO-TOW.COM DiamondWeave™ straps.
Step 3: Verify Working Load Limit (WLL)
Under DOT 49 CFR Part 393.102, the aggregate WLL of your tie-down system must equal at least 50% of the cargo weight. For a 4,000 lb vehicle with four tie-downs, each strap must carry a minimum WLL of 500 lbs. The industry standard for auto hauling straps is a 3,333 lb WLL per strap — well above the regulatory minimum for any passenger vehicle.
Never confuse WLL with break strength. Break strength is typically 3x the WLL. A strap rated 3,333 lb WLL breaks at approximately 10,000 lb — but you never load it past 3,333 lb in service.
Step 4: DiamondWeave™ vs. Standard Webbing
GO-TOW.COM’s proprietary DiamondWeave™ webbing (US Patent #8,136,555) uses a diamond-pattern weave that adds abrasion resistance at the contact points where straps cross trailer edges and anchor flanges. For high-frequency commercial operations, DiamondWeave™ extends strap life significantly over standard polyester webbing. The rated WLL is identical — the difference is durability under commercial cycle counts.
DOT 49 CFR Part 393 Quick Reference
- Minimum 4 tie-down points per vehicle transported
- Aggregate WLL must equal at least 50% of vehicle gross weight
- Tie-downs must prevent forward, rearward, lateral, and vertical movement
- Over-wheel straps must contact the tire at two points on each side
- Straps must be free of knots, cuts, burns, or abrasion that reduces WLL
- Each strap must be secured so that slack cannot release during transport