ryoung wrote:
From what I have read about your shed it has a 12 ft garage type door and 13 ft of ceiling clearance. 
If that is so, get rid of the garage door, enlarge the opening to the  13 ft ceiling and install a sliding door. 
Anything is possible. I once had a new pole barn built by Sikeston buildings that was 24 x 36 with eight foot walls. Over the years and different RVs that I had, that original pole barn grew to 24 x 65 with 14 foot walls in three different modifications.
ryoung
I no longer own the truck and TC in my signature.
We were told this is not suggested and the shed is heated and we would lose too much heat. The cost would not be worth it.  A sliding would also allow mice intrusion.