I researched tires extensively when I replaced them on our Roadtrek 210P.  I put back on the same tire I was replacing:  Bridgestone V Steel.  It seems the wall stiffness is very important on these vans chassis motorhomes.  You want a still sidewall.  I agree with overbrook.   I have read a lot over the years about various tires and problems with tires on Class B rigs and all I can say that eight years with two sets of Bridgestones and I have not one single complaint to voice.  
Paul