[Wavery]

You wouldn't have to cut a 2' x 7' hole. You would merely need to cut 2, 4' x 1' holes (one for each tire). dig the hole about 1' deep on the far end and 2" deep on the forward end. line the holes with 2" of concrete and you have ramps to back the trailer down and pull it out.....no jacks required. This all assumes that you have 9" of clearance under the trailer.

When selling the house, just fill the holes......no big deal.

When the trailer is not in the garage, you could "plug" the ramp holes with plugs made of 2x4s and plywood.

BTW......You can break out the concrete with a hammer drill and a concrete chisel attachment in about 1 hour. I just did this exact same thing in one of my apartments last week to repair a floor squeek.