Your stock tires should be a 235/85R16 with a load range G. A quick look of various tires shows a weight capacity of 4000# per tire, 3860 if used in a dually configuration. 4K x 4= 16k and figure 20% of trailer weight on the pin at GVWR of 17K, 3200#, you have plenty of tire carrying capacity with the stock tires/rims. Granted the brand may be chinese tire crap but there are good ST tire options in stock sizing.
Unless you are the unusual RV owner, you'll likely never wear out an RV tire. Time out yes, wear out no. We just don't put the miles on that OTR trucks do.
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2021 Omni SX32
2012 Crusader 355BHQ (girl friends)
2020 Ram 1500 Laramie 4WD, toad
2019 Harley Davidson Heritage Classic 114 (the toy)
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