Motorcycle type/class for the back of an RV

My partner and I are taking a RV trip through the U.S. and are planning to put a motorcycle on the back of the RV on the hitch. We are looking for a motorcycle that:

Is not too long as to stick out the sides of the RV (7'6''?)
Easily gets two people a combined ~400 pounds up the fairly steep roads in the western national parks
Fairly comfortable for occasional 1-2 hour trips
Not too expensive
Storage is not needed as we will drive it back to the RV at night

What class/type of Motorcycles would be good for such a trip? What size engine would work for the Rocky Mountains?

Edit: I could have been more clear, there are motorcycle lifts and carriers on can attach to the back to the hitch on an RV.

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