As is often the case, more is sometimes a bit better but only if not taken to extremes. If LR F has plenty of capacity margin for your specific tire loads, increasing to LR G just costs extra and maybe rides a tiny bit harsher. The important thing is that you are only going to inflate the tire for the actual load anyway, and the F &G both carry the same load at the same pis. The G rated tire can be inflated higher & thus carry more load, but you probably aren't going to do that unless the F-rating is already at its upper limit.
Other than that, the G-rated tire will have slightly stronger sidewalls to contain the extra psi. It's conceivable that might help if there is damage from a pothole or curb. It's also what can cause a slightly harsher ride, but you probably won't notice it.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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