The engine RPM calculator helped thanks. I'm currently running 245/70 19.5 its a 33" tall tire. I was just enquiring in the possibility I have to change my gearing or maybe go to a 225/70 19.5. I'm hooked on the 245's, running them right now makes the truck seem sluggish and I'm curious to see how they tow but will be hard on the truck, pulling the hills when I decide to do a trip in the mountain region. My 5er loaded is about 17000 with a GW of 18000.
I will be doing a trip for labor day weekend so I will see how she pulls before making a decision.
Hayden & Gigi
2008 GS Endura Max Toy Hauler
2014 F350 4x4 Lariat