I agree to sell is best. In the late 90's my wife and I spent a year on the road in a home made poptop camper. Went to AK all over Canada, baja etc. I stored my Suzuki GS850 in a garage and it suffered for it. You can always replace the Bike when you are ready. In terms of having motorized 2 wheel backup on your trip I'd consider a Golden Eagle Bike Engine.
Inexpensive, Honda reliability, easy to carry, no registration, go 20-25 MPH, (what's the hurry?). Have a great trip, you won't regret it.