Haven't done what you're planning, but a word of advise. With dualies, you have to watch the width of the tires. If they are too wide, they will be too close when mounted. When this happens, the gaps closes and can catch rocks and other debris between the tires, which can cause serious damage, blow outs and the results of that.
Of course a responsible dealer *should* warn you when this happens, but good to know if they don't.
Another note. Tire temp has more to do with proper inflation, rather than size. A properly rated tire with your coach weight, properly inflated for that weight is all that is needed.
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox