Rescue1 - Wow, I didn't realize they used 6-lug on the heavier rigs back in 2001 - I'm only familiar with what we saw in 2003 and later when we bought ours.
Anyway - I've got the same 6-lug and was concerned about the heavier rated wheels. I just went with this company
http://www.hispecwheel.com/ (series 4) and will have them installed tomorrow morning. They are rated for 3,200 lbs.
Ironically the Load Range D tire ST series 235/85R16 is rated for the full capacity of the wheel at 3,200 lbs@65psi, but a Load Range E tire LT series ST235/85R16 that Montana used is only rated for 3,042 lbs but at 80 psi. Not sure what tires you are running, but I believe Montana used both ST and LT through the years. Glenn can give you some good heads up on the pros and cons of either, but I know you don't want to swap ST series tires onto you TV, as they are only rated for 65mph. Either way, these wheels were designed for it. It was the highest load alloy wheel I could find for the 6-lug hubs.
Brad