Yeah, raising a 36' x 80' barn is not an option. LOL I would consider rolling on steel if it were concrete all the way back, but where it will rest is compacted dirt, and the rims would just create two deep grooves on either side, then it would most likely sink down over the winter, and be a real PITA to get back out over the 2" rise to the concrete floor.
I will see if there is some clearance removing the AC cover, provided I don't break any seals taking it off. Would hate to develop a leak in the roof. I will check it this weekend when I have time to put the stabs down.