I have a 2018 Greyhawk 26Y that I mounted a spare wheel&tire underneath. Got the wheel off the internet and bought new tire locally and had it mounted & balanced....$200 total. There was enough width between the chassis rails, but tight fore & aft between the black tank and rear hitch. You have to "shoehorn" it up & over the hitch. I used a 2 x 2 angle steel 42 inches long and drilled 1/2 inch holes through the frame rails and bolted it in place.Also, drills two 1/2 inch holes in the angle steel to pick up two of the wheel lug holes. Takes a little time working by yourself and the hardest part was lifting the wheel&tire up while I measured and drilled holes. Would be easier if just the tire.......I think I would "wrap" it somehow to keep it clean and out of dirt, etc.
Good luck on your project.
Paul
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