What's the GVWR? THAT is the limiting factor, not what the engine is capable of putting. Let's say GVWR is 10,000. Let's say truck weighs 8000. You can have a hitch weight of 2000. You will be limited by your GVWR. If you go over the GVWR........you are ILLEGAL! Get into a serious accident and YOU ARE SCREWED! There are so many illegal riggs on the road it's not funny. Unfortunately, 3/4 tons are fairly limited by their GVWR. I know this will rub some people the wrong way, but it's the law! I have been ticketed for being over my GVWR!