I do not know want thing about the chassis you have, and I see you have some responses from people who DO, but I would recommend that you express what issue is causing you to want to upgrade your suspension in the first place. Your mention of sway bars leads me to believe you have some kind of sway or stability issue, more than a load carrying issue?
Travel Trailer: 2004 Flagstaff 25LB
New Tow Vehicle: 2017 F-150 3.5 Ecoboost, supercrew short bed FX4 Lariat
Old Tow Vehicle: 2009 Silverado 2500HD 4x4 Ext. Cab Short Bed
Travel Pooch:Sophie the Sato - Cats: Rhody and Hazy
2018:22nights / 2019:31Nights / 2020:18Nights