How long is your RV? What is the weight?
Not sure if you bought these already or not.
On my 30' or larger RVs I upgraded my tires to Commercial load (121) to give 500lbs of extra weight carrying buffer per tire (2000lb total). I find the E-rated tires do not have enough carrying capacity buffer for my comfort level.
Note: You should never overload your axle. But all else being equal, Commercial rated (121) tires can more easily carry the load and therefore I feel they are less likely to have a blowout.
Safe travels!
Chris
