work2500hd

I would like to get my truck lifted as well as install new shocks. I have a 400-500 lbs cap on the bed I use to store tools. Truck rides ok but I have noticed it’s not as smooth as when I first bought it and the height seems to have dropped some. I was wondering what brand or lift system should I get? What kind of shocks? I’m new to truck suspension so any advice would be helpful.