That's a fairly large trailer for a single friction bar anti sway system. I believe even the manufacturer recommends no more than 25 Feet in length when using one bar. Add to that, friction bassed bars are strictly REactive so they don't do anything until you have trailer sway. That being said some of the friction based (Reactive) integrated anti sway systems do have a pretty good reputation (Equalizer for example). Even better is a proactive system like the Reece duel cam system (about the same price as Equalizer) or some of the high dollar models like Hensley or Propride.
To begin with make sure you have the WD set up per instructions from Ford (see your owners manual). They are now recommending that you restore only half of the front end rise where as it used to be restoring 100% of the front end drop. Do NOT assume that since it was installed by an RV dealer because they are NOT hitch experts in most cases. Many very large ones will not even install hitches but refer customers to a hitch specialist for set up.
All of that assumes that everything ELSE is correct (axle alignment on the trailer, using truck tires for towing not passenger tires and tongue weight is correct (10% to 15% of total trailer weight).
Good luck / Skip