I used a series of rope and pulleys to lift the fiberglass top from my jeep.About 200 hundred pounds.The load was spread out over several trusses with two double 2x6 beams made to span the entire width of the garage and resting on the exterior walls,14 feet.They were installed via a small hole cut in one gable end of the building. No problems.I Know its slightly off topic, however the work shop where we store our alaskan popup camper we use two large laminated wood beams that span the entire width of the building. We use them to lift the camper on and off the truck via four one ton chain hoist, one at each jack bracket. No more wobbly camper jacks or swingout brackets for us.The point is with a little additional work bracing and supporting as you suggested you should be fine.It may be overkill but I believe in making things twice as strong as needed for safety. Ramp
