Join Date: Apr 2009
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I have the same dilemma. I'd prefer to run at about 1900 RPM and my speed is ~ 60 mph. I'm planning on a larger tire and wheel upgrade. I found a tire size calculator via google, entered my current tire and then entered a 19.5" HD truck tire that I'll probably go with. The larger tires an wheels gave me 67mph.
I have a heavy Lance 1161 camper in the bed of my truck and the 19.5" HD truck tire upgrade is a popular mod on the RV sites to help stabilize the ride of RV's by reducing tire overloading and flex.
So for me, it's two birds with one stone.
00 F350 Lariat CC, DRW, 2wd, 7.3 , Auto, Tru-Cool MAX tCooler, Delrale Deep Cooling Pan, JW Valve Body, aFe Stage II Intake, aFe 4” Turbo Back, Pillar Mount Gshift Gauges (Pyro, Boost, Trans), GTP38R, Barder Billet Wheel, Bellowed Pipes, EBPV pedestal, PHP Hydra, Riff Raff FRX, HPX, EBP, Swamps HV/HF IDM, Dieselsite Max AC. 2014 Lance 1191 Camper, Supersprings, HD Timbrens, Sumosprings, Front+Rear 1.5” Sway Bars, Monroe Gas Magnum Shocks, 19.5" Vision Rims, Centramatics, Sumitomo 16 Ply.