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Remember that a stiffer sidewall will mean a harsher ride for the RV. These thing bounce around enough already. I am not a fan of 120 PSI tires ether. Way to hard and the position of the shock absorbers isn't very good in the first place. Another thing. The higher the air pressure in the tire the bigger the explosion when they blow. No matter how many tires that people recommend nothing is perfect. No tire is perfect. They all may fail at some time or not.
I have had Goodyears fail on my car.
I would just leave the tires on the RV and take it for a shake down run close to home and see what needs to be fixed and go from there. Tires would be down the list for me but hey it's your $1,200
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