Lots of opinions here, both ways. Contrary to some, there exist rigs that do not need either WDH or sway control. I would try it without and make your own decisions.
I would caution everyone to pay close attention to tire pressures. Under inflated (for the load you are carrying) will make any rig squirrelly. A WDH with sway on under inflated tires is putting a bandaid on a major surgical incision: a really bad idea.
I encountered a guy who swore his rig, essentially identical to mine, which tows straight as an arrow without WDH/sway, was a death trap. His was all over the road even with both WDH and sway. Turned out he had overinflated fronts and under inflated rears, having paid no attention to either the owners manual or the door sticker and just put 35 psi all around because he always had put 35 all around. When he tried the right pressures, he was astonished to find it solved the issue.
