Weight Distributing Hitch and sway bar.
Tuftruck springs (then if further help is needed, which is highly doubtful, add Airbags)
Bilstein 4600 shocks,unless you want to level,then 5100 shocks
if feel a "rolling" or "squish" effect, during cornering, d or e rated tires
check trail tongue weight, keep it 10-15%. Adjust trailer interior loads until that is achieved.
take your new rig, once properly set up,for late night drives. learn when roads are least congregated. Have a friend hand,with tools and such, who called upon if needed. Better yet,take a friend who has towing experience, with you,for pointers and suggestions.
Visit dedicated RV forumsfor mroe advice from those who tow regularly.
good luck!