I can tell you that on my 08 PRO-4X, I pulled our 8500 LB TT over 2 years on the stock Rugged Trails so...they will do the job without having to worry much. I just replaced them this winter with BFG All Terrain KOs which are a true 10 ply E rated truck tire, not a "P" rated passenger tire like the OEMs. I would just be sure to get an E rated tire regardless of which one you choose. They handle over 1000 LBS more capacity. I'm very happy with the KOs...excellent winter traction but haven't towed with them yet. Should be a great improvement.