Welcome to JOF
As mentioned, the WDH spring bars don't require removal or dis-engagement when backing the TT.
Based on your description it sounds like you have a standard Husky WDH "without" integrated sway control.
If your Husky Round Bar WDH looks similar to the following....:
....... Then for your 23RBM you should have one (two not required) friction sway control arm similar to this Husky model (or a Reese brand, etc.)......:
I'm surprised the dealer didn't include the sway control arm with your standard WDH.
Please note for any sway control device to be effective, the WDH should be sized/adjusted properly under loaded TV/TT conditions. I would recommended that a friend who is familiar with adjusting a WDH join you during your first attempt at adjusting a WDH.