Sounds like they pulled a fast one on you. Re the spare rim, if I were in your shoes, I would mount the sailun on the spare rim, and keep at PSI of 85. Not sure you will get a straight answer re PSI rating except from the rim manufacturer.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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