Join Date: Jan 2007
Location: Florida Panhandle
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I have towed around 8k lbs with my truck. Can't remember if I was running my "D" KM2's or my "E" rated Nitto MT's. I had no issues although if you keep the tires and tow much weight very often it might be beneficial to look into gears as I found I had to keep a close eye on EGT's on the interstate going bigger hills. My Nitto's are rated for 4150 or 4250lbs per tire (Can't remember) and are 37's.
FWIW I had a buddy that was towing a 40ft fifth wheel toy hauler that weighed 16k iirc and he was doing it with a SRW F350 on 35's. Less than ideal and probably not safe but he never had any problems, although he has now switched to a stock height dually.
I think as long as the tires are rated for the weight (pay attention to recommended PSI in the tires for the weight rating) and your gearing isn't causing to high of EGT's there will be no issues realted to tire size.
2000 Ext. Cab F350 SRW, 6" Skyjacker lift on front/8" BDS Springs on rear w/NO blocks, 37x13.50 Nitto Mud Grappler's, Aftermarket Front Bumper
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