I have a newer 16 foot Casita
that I park in a garage with a 6’11” door height. Admittedly, I have to swap the wheels to achieve this. I also have a friend that had the same model and he easily parked his in his garage with an 8’ door (no wheel swap). If I recall correctly, the Casita specs on my model listed a height of 7’8” with 15” wheels.
BTW, Casita installs the a/c on the 16 foot through the wall, rather than on the roof. If the reason you wanted no a/c was height, the Casita 16 foot would allow you to have a “cool” garagable camper. It’s my understanding that the 13 foot Casita shares the same a/c configuration and height of the 16 foot.
Hope this helps,