Interestingly, the ARP4 struggles getting in the main door of the barn. That requires going up a concrete ramp, and going over a low metal runner for the main sliding doors. My old Plus 4 got over that without any problems (providing only the driver was in the car). The ARP4 snags on the various bolts etc on its undercarriage. I will be challenging the members of my family who have more of a practical/engineering bent than me to come up with a solution to that one.
Presumably it only snags slightly? If so an 8' X 4' sheet of 25mm plywood laid on the floor against the door track should lift the wheels high enough, if not 2 sheets might do the trick.
