Hook it up and check the amount of squat at the rear tire. If it's one inch or less you're good to go. You want your best tires on the rear as a low tire or flat there makes for the worst instability. Check for rise at the front tire. You don't want any unloading there or it will result in instability too. Test drive. If everything doesn't seem solid then go to a weight distribution hitch with 500# bars. If you haven't replaced your shock absorbers it's probably time to do that. Have your tie rod ends checked for play. If everything's in good shape you should be OK but you're not too far off from it being an automatic requirement.