I negotiated a spare into my deal from the dealer, once he stopped coming off the price..... so the dealer through in a new tire on a rim.
Mine is a different model so this likely doesn't apply to the OP, but I found that the coach frame had mounting tabs under the rear. I bought a rack through Thor that was made by Morryde. Works fairly well, very basic, and would be easy for a handy person to DIY.
Honestly, I would be just about as happy.... in fact, in hind site I would probably prefer.... to have just a tire without the rim. I'll rely on roadside service to do the changing anyway most likely so the rim is just extra weight. I don't carry a jack or tools, but I suppose there might be an occasion when a wrecker service, or one of those roadside assistant services in the big cities might provide the jack but not have tools for mounting the tire... so teh rim is a plus in that regard..
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