A trailer wheel chock is an industrial wedge sized for highway trailer tires (typically 22.5-inch wheels with 11R22.5 tread on Class 8 trailers, or smaller on tandem-axle utility trailers) that prevents trailer roll during loading, parking, or trailer-tractor separation. Material selection (heavy-duty rubber, urethane, or articulating tongue-jack chock), size (15 to 18 inches for Class 8, 8 to 12 inches for utility trailers), and placement (pair-of-chocks against rearmost-axle tire) drive both regulatory compliance and operational reliability.
What Makes a Trailer-Specific Wheel Chock Different?
Three differences distinguish trailer-specific chocks from generic industrial chocks. The differences matter because trailer roll behavior is not the same as truck roll behavior.
1. Tire Diameter and Tread Profile
Class 8 trailer tires are 22.5-inch wheel diameter with 11R22.5 or 22.5LP-class tread. Tandem-axle utility trailer tires are typically 14 to 16-inch wheel diameter with much narrower tread. A chock sized for one is undersized for the other. The chock height (wedge profile) must reach at least one-third the tire diameter to prevent tire-over-chock rollout.
2. Trailer-Tractor Separation Risk
A trailer detached from its tractor relies entirely on its parking brake and chocks. Trailer-specific chock practice often includes articulating tongue-jack chocks that wedge against both the trailer tongue and the tongue-jack stand to lock the trailer-tractor coupling state.
3. Tandem-Axle Load Pivot
Tandem-axle trailers can pivot around either axle when loaded. Chocking the wrong axle creates an unprotected pivot vector. The OSHA-citation-safe practice is rearmost-axle chocking. See our wheel chock placement on a trailer guide for the placement procedure.
What Materials Are Used in Trailer Wheel Chocks?
Four materials dominate trailer chock procurement. Each carries a different friction profile and cycle life.
Heavy-Duty Recycled Rubber
The dominant material for Class 8 trailer chocks. 70 to 80 Shore A durometer, 15-inch length, weight 18 to 25 pounds. Friction coefficient 0.85 against typical wet pavement. Recycled tire rubber feedstock keeps cost moderate ($40 to $90 per chock). Cycle life 8 to 12 years at typical fleet-yard frequency.
High-Density Urethane
Better cold-weather flexibility and longer cycle life than rubber. 80 to 90 Shore A durometer, 12 to 15-inch length, weight 12 to 18 pounds. Friction coefficient 0.9. Cost $80 to $180 per chock. Best for refrigerated trailer dock operations and high-cycle fleet yards.
Articulating Tongue-Jack Chock
Steel-and-rubber chock designed to wedge between the tongue jack and the trailer-tongue beam, preventing tongue-side movement during loading. 12 to 18 pounds per unit, $50 to $140 per chock. Best for detached trailer parking where tongue-side stability matters.
Wood (Hardwood)
Oak or maple chocks are still used at some legacy fleet yards. Cost $20 to $50, cycle life 2 to 5 years before water absorption rots the chock. Friction coefficient 0.5 to 0.7 (lower than rubber). Generally being replaced with rubber as legacy inventory wears out.
What Size Trailer Chock Do You Need?
Chock size scales with trailer tire diameter, vehicle weight class, and slope conditions. The standard sizing table for trailer chocks:
| Trailer Class | Tire Wheel Diameter | Recommended Chock Length | Chock Material |
|---|---|---|---|
| Class 8 (53-foot van) | 22.5 inch | 15 inch heavy-duty | Rubber or urethane |
| Class 7 (40-foot single-axle) | 22.5 inch | 12 to 15 inch | Rubber |
| Class 6 (refrigerated, smaller) | 22.5 inch | 12 to 15 inch | Urethane |
| Tandem-axle utility (10K to 14K GVWR) | 14 to 16 inch | 8 to 10 inch | Rubber or urethane |
| Light-duty utility (under 10K GVWR) | 13 to 15 inch | 6 to 8 inch | Rubber |
How Do You Use a Trailer Wheel Chock?
The OSHA pair-of-chocks placement procedure applies. Two chocks against the same rearmost-axle tire, one on the forward face and one on the rearward face, after the driver has set the parking brake. On slopes, the chock goes on the downhill side of the rearmost tire; for slopes above 6 percent, chocks on both sides. See our how to use wheel chocks guide for the complete sequence.
Trailer-specific procedural additions:
Detached-Trailer Jack Support
OSHA 29 CFR 1910.178(k)(2) requires fixed jacks under detached trailers during forklift loading. The trailer's landing gear is supplemented or replaced with a fixed jack stand. Chocks plus jack-stand together deliver detached-trailer compliance.
Tongue-Jack Stabilization
Articulating tongue-jack chocks engage between the tongue jack and the tongue beam to prevent the trailer from pivoting around the tongue point. Particularly important for tandem-axle trailers detached from their tractors.
Tandem-Axle Pivot Lock
For detached tandem-axle trailers under high-load forklift entry, some operators use chocks at both tandem axles rather than rearmost only. This is operator-policy driven and exceeds OSHA minimums but eliminates load-shift pivot risk.
What Does a Trailer Wheel Chock Cost in 2026?
Industry Baseline Range
| Spec | Per-Unit Range |
|---|---|
| Heavy-duty rubber, 15-inch (Class 8) | $40 to $90 |
| Urethane, 15-inch (Class 8) | $80 to $180 |
| Reflective-stripe rubber, 15-inch | $60 to $120 |
| Articulating tongue-jack chock | $50 to $140 |
| Heavy-duty rubber, 8 to 10 inch (utility) | $25 to $60 |
| Wood (oak/maple) | $20 to $50 |
Current Market Reality
Recycled-rubber trailer chock pricing has stayed relatively stable through 2025 and into 2026. Pacific Northwest freight has added 8 to 12 percent to delivered cost. Bulk-tier procurement through industrial-supply channels typically delivers 15 to 25 percent discount on orders of 50 units or more. See our wheel chock cost guide for full category pricing detail.
Where Has Cojo Specified Trailer Wheel Chocks?
In March 2026 Cojo specified 18 heavy-duty 15-inch rubber chocks for a Hillsboro fleet yard handling 9 Class 8 trailer parking positions (two chocks per position). The yard also received 6 articulating tongue-jack chocks for the three positions where trailers are routinely detached from tractors during multi-day storage. The procurement was bundled with broader parking-products and yard-layout planning. Total project runtime: 1 day for procurement, 2 days for delivery, half a day for operator training on the placement procedure.
Get a Trailer Wheel Chock Specification Quote
Trailer wheel chock specification combines tire-class match, OSHA pair-of-chocks rule, slope adjustment, and detached-trailer jack-and-tongue control. Cojo's site walks deliver a complete chock specification for the yard or dock as part of broader parking-products planning. Get a custom quote.