Get a couple of people whose combined wt. approximates the wt you plan on and have them sit on the bumper or deck lid,or git in the trunk and try to hang out as far as possible,see how that looks.Weight and support-wise.I am gonna make one of these,been thinking about it for a long time.I cannot get Jolly in the pick up bed and the car hauler seems like overkill.I had not thought of a ramp,was gonna use a hydraulic jack,may still.Also thought about using a tire and wheel mounted on a swivel to hold the wt. or part of it.That way,you could put any bike on that would fit.Gets kinda complicated,would need to have it's own suspension,be pretty ungainly to move around by itself,be viewed as a trailer,probly.Anyway,you could put an air bag set up on the vehicle if needed,no air when not needed,you know,and infinitely adjustable when loaded.