I would definitely get a frame mounted bumper, no matter what weight you are towing. You can get the proper ride height for the trailer, which cannot be done with a bumper hitch. Too high and you have too little tongue weight which can be dangerous. Same with too low with too high a tongue weight. Also with a frame mounted hitch, if down the road you need to tow heavier, you can with a WD hitch. Something that can't be done with a bumper hitch.