I always raise the trailer tongue once it is connected to the tow vehicle with the tongue jack. You can raise it as much as needed to relieve the tension on the bars. I raise mine enough so I can hook up the chains and flip up the hook by hand without using the pinch bar. It's also a good way to check ball and coupler connection.
BTW, I have the Resse Straight Line WDH. Works very good and no need to have the friction sway bar.
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129