XP 4 1000 Length

I am negotiating on a 5th wheel toy hauler that states the garage is 12′-2" long but the part of the garage with the half bath only measures 11′-11" long. If I let the air out of the tires or ? is there anyway to fit an XP 4 1000 in this space. I currently have an arctic cat wildcat 2 seater that will definitely fit but we are going to be trading for the Polaris this fall.
I know guys put smaller tires on there sand rails to fit them in the trailer so I thought maybe there is something that can be done to make things work.