I'm with Doc Brown - I'd look around for another place to keep it. They are that good.
Ours does fit in its "camper cave". But even with a good fit, one needs to ensure that the roll up door is ALL the way up before exiting. We just about took our AC unit off on our first trip. You would not believe how big a noise that danged thing made.
Luckily, the hard collision made the door spring upward so we didn't disengage anything. We do, however, have a nice bend along the bottom edge of the door.
I doubt that you can do anything that hasn't already been done by people on these forums . . . including realizing the TT won't fit until AFTER you drag it home.
Kathleen and the "Big Guy" (BG)
Homer the Beagle
2016 Acura MDX - 2015 X20E
10K Equalizer; Teshonka P3
Dual 6V Deep Cycle Interstate Batteries