Race Ramps

Depends on the ramps. The ones you have pictured may be stronger because they're tied together across the bottom and have that extra down brace in there. But I see a lot of those metal ramps that aren't tied together across the bottom and don't have the extra brace, and those can be sketchy. The only thing keeping that kind from pancaking is the shape the metal is stamped into.

It all comes down to the crush strength of the support, the amount of surface area they cover on the ground, and how well the wheels are stopped from rolling off the support. Race Ramps is a reputable company, those metal ramps are produced by a lot of companies that aren't so great. Not saying that's what you have, but they're out there.