Most tire stores have sizing charts that state " OD,Width,Curcumfrance,Revs/mile" so you should be able to find same OD from 15 to 16 inch rims. Did this with my car 16" winter wheels to 18" summers. And as for 3 years...my old trailer was 10 years old and was from Niagra Falls to Yellowstone to St.Louis,MO in those years plus LOTS of shorter trips.
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Steve & Sandy
2006 GMC Duramax-Edge Evolution
2011 CT29RLX
Bikes,Canoe,toys,toys,toyz
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