Ed Manifold wrote:
Thank-you for your responses of which has convinced not to get the spare tire carrier plus your great responses saved me $600.00. I thank everyone again.
Gee. All of this negativity from people who apparently don't own one.
We have one on our Winnebago (yes..a gasser) and I'd never want to go back to the under the frame rack. It works great and would make accessing the spare tire for me (or a road service tech) much easier than with under the frame rack. Also, the tire doesn't bottom out when transitioning some driveways like it used to. They have several sets of holes in the drawbar so you can adjust the fit and distance from the rear of the coach.
Have you looked at the online information about them from Roadmaster? Funny thing, but they show one being mounted on a diesel pusher. While we don't have a rear radiator diesel, ours has 12" of space between the tire and back of the coach which I think would be plenty of distance for air circulation. If in doubt, why not contact Roadmaster and see what they have to say?
http://roadmasterinc.com/products/spare_tire/index.html