We've had several class As with automatic leveling systems but now we have a class C and I'm considering what type of blocks to use. Our rig (27') came with a bunch of those stackable deals but I thin...
I have some that look like yours. After I built them I took them back apart and used a large hole saw from Harbor Freight and drilled a bunch of holes down the center between the two screw lines. I'm not sure if it matters but I made sure to stagger the holes between the levels. So far I've had no issues and it really lightened them up.