The issue lies in your wheel base length BUT the biggest factor is the Independent rear suspension. Im in a similar situation.
Ive got a 04 f150 and 13 Toyota Sequoia. Night and day difference towing an 8×16 Yetti. (single axle). Ive also got a tandem axle enclosed 7×16 trailer that tows better with both vehicles being its a tandem.
What I’ve noticed towing with the sequoia, which is also independent rear…
– Had a lot of roll and loose rear end when getting side wind.
– Went load range E tires with stiffer side walls, helped some but not the fix.
– installed air bags in rear end, again helped some but not the fix.
– Made sure trailer was towing level and not high in the nose, helped some but not the fix.
Ive pretty much given up making any changes to the situation and just live with it.
When vehicles pass me it is a total pain in the A$$, when the nose of a vehicle gets even with the V of my fish house, the air the other vehicle is pushing hits the V and pushes the V away. BUT the trailer nose getting pushed away causes the nose of my sequoia to be then pushed toward the passing vehicle…
This does not happen when towing with my truck sold rear axle and longer wheelbase, nor is it as bad in the sequoia towing the tandem enclosed trailer.
IMHO, your (and mine) vehicle is not made to tow even thought the specs say they can tow the weight… Also, I don’t thing the tongue of the yetti is designed for an equalizer hitch, and the different stresses they cause on the tongue of the trailer.