The 3750FL has a GVWR of 16,000 lbs, so until you measure actual, you should plan on about 20% of that weight resting on the hitch, or about 3,200 lbs. Your truck payload needs to handle that 3,200, plus weight of passengers, pets, cargo, tools, hitch, bed liner, bed cover and anything else in the truck. It would be pretty easy to get into the 4,000+ lb payload territory. You should see if your truck's sticker supports anything near that weight.