Your answers differ because a lot of people don't really know about towing requirements (including dealers), and because the information you have provided isn't enough for any sort of educated opinion. What you need to know is your truck's payload capacity, GVWR, its axle ratings (GAWR) and a few other things. Knowing its axle ratio would be helpful, engine size is important, etc. Does it have a tow rating? That's another helpful (but not definitive) figure. Check your owners manual and the stickers/plaques on the door frame for some of these figures.
Good luck!