Al,
Are your wheel chocks the plastic kind like they sent me ? If so, then you will have to modify them too. I glued a piece of rubber on the bottom of mine and now they hold like mad. But that plastic bottom on the powder coated ramp was like a skate on ice. I got one of the first sets of ramps they sold right after they started the business so I would guess they have made some great improvements over the years. Mine are 14' 9" in length.
Take care, and have fun. Raining like all get out here right now.
Ron
