What I'm adding:
http://www.carlisuspension.com/dodge-ram/suspension/levelingkit.htmlhttp://www.carlisuspension.com/dodge-ram/components/frontendkit.htmlhttps://kelderman.com/dodge_ram_2003_2009_2_stage_rear_air_suspensionIf you haven't upgraded tires a 265 would be a good compromise, tread your choice.
Stock front ends are good for cummuting only; add bigger tires or work the truck and you get slop/wonder. Upgrade the ball joints, end links and track bar. Also, get a steering box brace; got mine a couple of years ago from Custom Diesel for well under $100 shipped.
Finally, do the fuel tank vent mod; my fill time was cut down greatly and my capacity jumped to over 42 gallon. Now, when the nozzle cuts off, I only have about 1/2 gallon left to top off, which I do all the time now.