I think the width would be OK, but you can double check the x1's specs at mastercraft's web site. If I remember right it is 95 inches wide for a single axle and 96" for a double axle. Make sure your 7 foot garage door is actually 7 foot. Mine was actually less and I had to modify it to get about 6'11" and it as tight as can be with the swivel board racks down.
Width wise, Kevin's specs are correct, so you are just fine. I have no problem with my boat height wise, which has the same 2002 style tower. Fits in with about 2-3 inches to spare. My trailer wheels are 14", which is normal I believe.
It fit! Picked it up last night. Will try to post a picture here later. I have the 2500HD with about an 8 inch drop hitch and just snuck in the garage with about two to three inches on each side, less than an inch to spare on top, and about 3 inches to spare depth wise with the tongue folded away. Now I see the forecast and it's suppose to get in the teens with high winds here! I have a problem light in the engine compartment now, but fearful that may not be enough heat!
yes, swim deck is off. I'm not at home to measure my garage right now though. I know when I have my truck in the garage (2500 HD x-cab short bed) I have a bout 2 feet of clearance from the rear bumper to the garage door...if that helps at all.