rubenray, yes you can use it without the bars. OP, you do not need a WDH to tow your trailer. But you may want one anyway. I find a WDH smooths out the ride, especially going over those rolling bumps. The WDH takes some of the bounce out of the truck springs. Then there is the added benefit of sway control built into many of the WDHs. Try it without and see what you think. Dealers will often give a heavy discount on the WDH when buying a new TT.
2016 Arctic Fox 27-5L
2022 Chevy 3500 Duramax