We don't have a GD, but our garage is a similar size. The only "protrusions" on the side are the rails for the rear beds. Probably about 1.5" on each side, and they do not go all the way down to the floor and are in the back end of the garage. I believe the GD has the same sort of set up in the back (assuming there's no built in floor cabinets towards the front of the garage). So if you load them in one by one and store them towards the front of the garage (where there are no side protrusions), then I think you'd be fine.