You could prob go up to a 14" but Im sure would void any warranty (or whats left) doing so. I have the 13" wheels on my TT and have found they are not a common size in most shops should you need one replaced (D rated). I had to order a set online to replace the worn ones on my previous unit with the same size since no one could get them locally. If you have the room in the wheelwell and between tires I say go for it, atleast to a 14".
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16' Amerilite 248BH Friendship
15' Chevy Silverado LT/88' K5 Blazer
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