Difference Between a Trunnion and Round Spring Bar

I use a round bar on my 3.5L V6 Highlander, also rated 5000 pounds.

And look at the Andersen hitch, which is an entirely different principle - uses the compression of hard polyurethane -like on the down movement , and the relaxation of the chain on the up movement.  Supposedly less rebound.

Originally posted by M0tl3y Round bar, to my understanding, is on WD hitches only. Whereas Trunnion bars are both WD and anti-sway.

Both round and trunion provide WD and sway control. Trunion may have a bit more ground clearance, but neither is a problem. Round bar is a bit cheaper and entirely adequate.

As I understand it, a trunnion flexes less than a round bar. If the TV has a real frame, a trunnion might be better because the bars are further off the ground, so there's less chance of a scrape on the pavement when you hit a dip. If the TV is a unibody, the extra flex of the round bar may act as a shock absorber to help prevent damage to the body panels.