Using a 5.7 to pull 5500-6000lb gross load. Tried a 5.0 V8 to pull the same trailer with 5000 gross load and it couldn't handle it in summer heat. Get a trailer with brakes or you will eat up your truck brakes quick and possibly even damage rotors. Just because a truck can stop a trailer with no brakes does not mean it's safe! Tongue/hitch weight comes down to loading the trailer properly for balance. The heaviest equipment should be directly over the trailer axles if possible.