I know this isn't much help, but ...
My experience is reflected in post number 151 in this thread
http://www.trailmanorowners.com/foru...?t=5586&page=4
I bought my wheels from the local franchise of a chain tire store. I think it was Tire Warehouse. The white-painted steel wheels looked exactly like the TM wheels, and I have seen them elsewhere. They were stamped 2600 pounds, so I was satisfied.
Rick had the same experience - see post 94 in the same thread.
My conclusion would be that you do not have to go online and pay outrageous shipping costs. Your tire dealer should be able to order 2600-pound wheels as part of his normal delivery cycle. Or you might visit a few tire shops in the area and see if they have them in stock - one of them probably will. Just tell them you want white-painted steel, size 15X6, bolt circle 5 on 4-1/2, 2600 pound rated. When you get them, get metal valve stems installed, and balance them.
Bill