What size A/C unit?

I've tried letting the air out before and didn't like it. I make a slight turn inside the carport and the tires looked like they were going to come off the wheels. The A/C unit on this trailer is 14" from roof to top of A/C unit. I've measured the Coleman Mach 8 low profile on other trailers and it is only 8" above the roof. I travel to Arizona and Utah but only in the spring and fall so I am not worried about 100 degree temperatures. I think I'll stay with the 13.5K unit and call it good. I was just trying to do the math but like someone said there is a lot of variables to consider...not worth the effort.

Griz14