Finally found a wheel and mounted the spare tire underside in the space provided. Close fit, but did sit in the space nicely. I used a 2x6 mounted to the channel frame with 1/4" lag screws. The front area of the tire to rest on the 2x6. The rear area rest on the tow hitch member. The tire is clamped down with perforated hanger strapping and 1/4" machine scr's, washers, nuts. No drilling was required for the mounting. The only draw back from my point of view is that the tire and wheel are quite heavy. Maybe weighing in around 60-70 lbs. and an old dude like me had a time leveraging it into place.
The total cost of tire, wheel and mounting came to around $200. It may not be worth the time and money for some who don't travel in remote areas. For me, it is more of a convenience and independence than anything. I would not want to wait for hours in a remote area for a tire repair. I have a tow and emerg. road service thru CoachNet, but they only pay for changing a tire, not mounting a tire. A neighbor of mine had to call a tire repair out to his coach and the charge was over $100 for mounting the tire. Maybe some folks on the forum have had a tire changed and can jump in with some info tire mounting.
Below is where I bought the wheel. I don't have any connection to the company other than being a customer. It was the best price I could find. The dually rims are not as easy to find around my neck of the woods as I thought they would be.
steel-16x6-wheel-rim-3872
Below is a pic of the installation.
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