I don't know what the angle of this rig is. I think it's around twenty degrees. I've had no clearance issues with them. I use 'em on all our rides. The ramps can come out and just leave the pedestals, in case I need to get under the sides.
i thought about making my own, but i saw the ones at autozone online i was gonna take a ride over there and check it out but i don't have my car with me today so jw