iSaddle Dual Trailer Dock Chock for 6" Dual Swivel Jack Wheels — Nitrile Rubber, Drainage Hole

iSaddle Dual Trailer Swirl Jack Caster Double Wheel Dock Chock is a heavy-duty nitrile rubber wheel dock designed to stabilize and protect 6" dual trailer jack wheels on soft or uneven ground.

Keep your trailer jack wheel from sinking, shifting, or collecting grime with a purpose-built dock chock made to fit dual swivel caster wheels. Constructed from durable nitrile rubber, this dock spreads load, resists oils and abrasion, and includes a drainage hole to help avoid water pooling. It’s an uncomplicated, portable accessory for RVs, boat trailers, pop-up campers and other towable rigs that use dual 6" swivel jack wheels.

How does this dock chock stop the jack wheel from sinking or rolling?

The chock creates a wider, stable contact area under the jack wheel so weight is distributed over a larger surface, reducing ground pressure. Its textured base and profile resist sideways movement, while the dual-wheel pocket keeps the caster aligned to prevent rotation.

• Large nitrile rubber footprint spreads load to reduce sinking.
• Deep wheel recess secures dual wheels and limits rolling.
• Grippy underside and geometry minimize lateral slipping.
• Works on mud, sand, gravel, grass and soft dirt.

Will this fit my trailer jack caster and how do I check compatibility?

iSaddle recommends this dock for dual swivel caster wheels with an overall diameter near 6" (150 mm). Measure the jack wheel diameter and compare to the dock’s internal wheel cavity before purchasing to ensure a proper fit.

• Recommended for 6" (150 mm) dual swivel caster wheels.
• Measure wheel diameter and face width to confirm fit.
• Compatible with most solid rubber and nitrile dual wheels on the market.
• Not intended for oversized or unusually shaped caster wheels.

How does the material and design protect the wheel from dirt and damage?

Made from premium nitrile rubber, the dock resists oils, abrasion and wear while cushioning the wheel from sharp objects and rough surfaces. A drainage hole allows water and debris to escape, which helps reduce contact with moisture and grime that can accelerate corrosion on metal wheel components.

• Nitrile rubber construction provides oil and abrasion resistance.
• Protective cavity shields the wheel from mud, sand and gravel.
• Drainage hole prevents standing water and reduces rust risk.
• Easy to wipe clean and store when not in use.

How simple is it to use and where should I store it?

The dock is designed for quick placement under the jack wheel—slide it into position, lower the jack onto the dock, and you’re set. Its compact, stackable shape makes it easy to stow in a trailer compartment, garage shelf or utility box between trips.

• Place under wheel and lower jack—no tools required.
• Lightweight but heavy-duty for repeatable use.
• Stackable profile for compact storage in tight spaces.
• Easy to clean with a hose or rag after use.

Who this is for: iSaddle’s Dual Wheel Dock suits RV owners, boat trailer users, campers and anyone who parks trailers on soft or uneven ground and wants a simple, durable way to stabilize and protect swivel jack caster wheels. If you use a 6" dual caster and want to reduce sinking, sideways movement and exposure to mud or oil, this dock offers a practical, low-maintenance solution.