Can I use these leveling blocks with Class A RVs?
Camper levelers are a better choice for Class A RVs. This leveling kit is made for Class B RVs, Class C RVs, travel trailers, campers and vans.
What purpose does the black blocks serve?
These black blocks form a ramp to keep the edges of the blocks protected (no issue of cracking). By the way, they help SMOOTHLY move up the levels.
What purpose does the wheel chock serves?
These leveling blocks act like wheel chocks, biting into both the tire and the ground beneath to ensure a tight grip.