Just to complete the story, I also got a response from the Director, Commercial Truck Products from sailuntires.ca:
"Bruce, the suggested rim width is 6.5”. The allowable rim width is +/- ½” so you will be okay with the rim width of 6”. The bigger concern is the pressure rating on your wheel. Typically, there is an 80 psi rating and a 110 psi rating. If your rim is rated for 80 psi, you can still use the S637 tire, however; you can only inflate to the maximum of 80 psi. I am guessing you are considering the S637 so you can carry more load than with your current tire which may not be possible with a rim rated for only 80 psi. One advantage you will gain is the increased speed rating. The regular poly-steel ST tires are generally rated for 55 mph. The S637 is rated for 75 mph."
I further asked if you deviated from the 6.5" rim, which is the preferred direction, smaller or bigger:
"Bruce, it may depend on the clearance in your wheel well. I would also check your owner’s manual for the trailer. I don’t want to recommend one or the other without knowing all the specification information. If it were my trailer and everything met the trailer manufacturer’s specification, I would go with the 7” if the 6.5” was not available."
I did find a few more potential 6.5" rims manufactured by HiSpec. Load rating implies 110 psi, but doesn't specifically say. Have to contact them directly to ask.
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New: 2021 Solitude 380FL
Old: 2016 Alpine 3600RS
Tow: 2017 F-350 DRW diesel
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