It turns out the ramp joints have rubber fittings at their bases. The problem is simply that these fittings were designed with too steep of a profile (it looked like an incline of between 1:1 and 1:3). Ideally the profile angle of the fitting should be more comparable to the angle of a wheelchair ramp or speed hump (1:12 or shallower). The only challenge I can see to doing this is ensuring that the rubber fitting is glued down with a sufficiently secure epoxy that the thin end does not lift up. I hope that is not an insurmountable challenge.