Just took delivery of my 1st HD pickup 2 days ago. It is a Big Horn CC 6.5 box Cummins Aisin 3,42 rear with auto level. .I expect to eventually load it with a 3.5 -4,000 lb slide in but right now it is unloaded. I may add a 3oolb cap when not using the slide in. What can I do to improve the ride...