From Camping World:
The Lock-N-Stop Chock interlocks with RV Leveling Blocks (item # 56857 and Camping World item# 56865) to stop dangerous wheel movement and rolling. Sized for use on larger truck, trailer, and RV wheels, the 8.25" wide chock and half-size leveler let you level and chock simultaneously. High-impact polypropylene material with a corrugated surface is lighter than wood, won't rot, and won't absorb moisture. Easy to clean - just hose it off! Made in the USA.
Interlocks with RV Leveling Blocks (#56857).
Stops dangerous wheel movement/rolling.
Sized for larger truck/trailer/RV wheels.
8.25" wide chock, half-size leveler included.
Lighter than wood, won't rot, won't absorb water.
SPECIFICATIONS:
Weight: 2 lbs.
Chock Size: 8.44" L x 8.44" W x 5" H
Manufacturer: Prime Engineered Plastics Corp.
Model#: RKCW819008