Have you seen the "Fuzion," by keystone. What a nice layout. Saw one at the dealers.
What model HD do you have. the RK has a wheel base of 63-64 inches. Some models are 66-67 inches
The 2008 HD had an overall length of 93.6 inches.
My Nomad had a wheel base of 68.5 and an overall lenght of 98.6 and it was difficult to find anything to haul it comfortably.
Take a tape measure with you, if you are close enough to a dealer, and measure the inside of the garage. You can always park at an angle.
I did a search on keystone mountineer toy hauler and some listing have the lenght of the Garage. The Fuzion that I saw had at leasst 12 feet of lenght in the garage. (39ft model)
The Fuzion