Hmmm...well, my 2009 800 RZR with Polaris rear brush guard and EMP front bumper is 9ft 2in long. So an 11 foot garage should give you room.
I have my 17.5" wide ramps on each side of the inside of the garage. My RZR has 11 inch wide Pitbulls on the rear and Polaris 3" off set wheels. The wheels clear the ramps with about 2" on either side. So without ramps, no problem with width!
That's one of the reasons we went with the 3800, 14 ft garage. Shortened to 12 ft on one side for the rear bath, but still have 3 feet to walk around the front of the RZR.
I really wanted the 3818 with an 18 ft garage, but the living area is smaller and I was told emphatically NO...by my wife, er BOSS.