I have only pulled a tandem axle toy hauler but have numerous friends that tow triple axles. I haven't met anyone that has towed both prefer a tandem axle over a triple axle and all have preferred the triple axle.
I just don't get the whole tire argument and never ending discussion. Buy some expensive LT tires and be done with it already, it's just not that complicated. I have XPS RIBS and like everyone else that has owned them they recommended them and seem to have little to no issues. I've also never heard anything bad about the Maxxis and that would be my other choice if I was choosing a non commercial LT tire. I hated spending the money on the XPS RIBS when my tires were like brand new but I sure feel more comfortable towing and that is worth a lot. Plus, I can tow at 65-75 mph comfortably and safely.
2015 Momentum 385TH
2011 Fuzion 322 Touring Edition III (sold)