Welcome to the forum and congrats to your Rockwood.
You want to try and get a hitch that doesn't add a lot of weight to your truck. We have the "Anderson Ultimate" 5th wheel hitch which weighs in at only 75#. Air bags will definitely improve the handling of your truck but the specs say your 8289ws has a 1337# dry pin weight without factory or dealer options installed and without cargo. The trailer might exceed the weight carrying capacity of your Silverado.
2013 RAM 3500 Dually Longhorn
2014 Trilogy 3650RL, W/D, Onan 5500, 8000# Axles, IS, 960 Watt Solar, 6x6 Volt Battery Bank, Freedom SW 3012 Inv/Charger