I have a F-350 SRW 4x4 and I need to replace my OEM (JUNK) Continental 275/70-R18 125/122s - E tires. I need a tire 70% highway/30% off road/snow rated tire. A tire with heavier side walls at the load E range. I would like to go higher then the standard 3640 weight limit do to the 3900 lbs. Lance truck camper I use while towing a motorcycle trailer. The truck has a 5000 lbs. Airlift system over the rear stock suspension and pulls up and down the mountain's of Colorado with no problems. Just have a issue with the excessive bulging of the tires under the load and yes I know I'm at my weight limit for this truck. Looked at the Goodyear AT adventure with Kevlar or DuraTrac 325/65 R18 with a 3860 weight rating. Any advise. Thanks

 

Toyo AT II's in LT285/75R18 will haul the weight but I cant speak for the sidewalls.

 

I had the 18inch continentals and hated them. 30k and they were toast. And I could really feel them flex when hauling heavy

I found a set of platinum wheels and went 275/65 Duratrac e load and love them way stronger I have 20k on them and you can't even see any wear yet and absolutely no road noise.