The issue of backing with the anti-sway bar attached has less to do with running in reverse than the angles one gets when inserting a trailer into a campsite.
Towing forward will rarely see severe angles between the tow and trailer.
But, when we back the trailer, we can slowly go right to the limits of the ball & coupler system. At those severe angles, its is possible, even likely that an anti-sway system will stressed beyond its designed limitations.
So, will a sway bar be destroyed when you back up to adjust your rig at the gas pump? No, don't worry.
But is it a good idea to yank it (and the WD torsion bars) before starting the process of backing into a camp site. Just to make things easier and safer.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!