looking at a stainless steel ladder designed to hook over the top of the door, then bolt to the bottom of the door. Wondering about the weight restrictions on the hinges of the doors. this unit can be upgraded to carry bicycles, two of them. That even adds more weight to the door hinges. but the convenience of the bicycle rack versus the way I'm doing it now is tempting. What do you guys think? How much weight can those hinges take? Am I asking for bigger troubles down the road?