On my 2500 Ram with my 28' enclosed trailer I now use both the weight distribution bars & sway control. Does it need it, no. It still pulls fine without them but yes, it does pull even nicer using them both. Not sure how much better the sway control helps but since I have it all I use it. No issues, better safe than sorry.

1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.