any suggestions as to a brand & length of toyhauler trailer you can pull at 6300 gvwr-1993 5.8l bronco?

going to dealerships to shop for a toybox trailer-at 6300lbs GVWR and short wheelbase i realize my options are limited, i don't want a big trailer anyway-the only problem i have been running into is dealing with salesmen who act like they are suggesting trailers that would work but at new prices or close to my max pulling cap.-so after searching the web and trade magazines for used i still cannot get a staight answer as what make and model of trailer my bronco can pull safely-also still trying to figure out the formula for GVWR TO GVCWR