I'm actually asking myself the same question regarding my F250 (10K GVWR/3.73) and the 3670RL. I have read the threads in this forum and, it seems, there are two camps; those who have chosen to buy larger trucks and those who are towing this size rig with a 3/4 ton and feel confident while doing it. In the case of Ford, the difference between the 3/4 and 1 ton rigs is the overload springs on the rear axle...that's it. Oh, and the little sticker on the door. Engine, transmission, drive train, etc., are all the same. I feel that if you're not convinced your truck will handle the load you have two choices, buy a new truck or modify the 3/4 ton to handle the load. Some swear by air-bags for better control and load leveling and some have added the overload springs. Don't you imagine there are many 1 ton SRW and DRW rigs out there that are "overloaded"? In addition, one does not have to load the rig to the max GVWR of the trailer. In the case of the 3670RL you have almost 4,000 lbs difference between dry weight and GVWR! Be sensible in the loading and traveling habits (read, speed) and I think you'll do fine.