The sway control system on your 2020 Ford Expedition is designed to help after the sway event starts. With that said I highly recommend going with a weight distribution system that helps to keep it from ever happening like one similar to the Equal-i-zer Weight Distribution System w/ 4-Point Sway Control part # EQ37100ET which is by far my favorite.
When choosing a system you want one that has the tongue weight rating that is equal to the tongue weight plus anything behind the rear axle.... view full answer...