3/4ton 1/2ton swap

ok i i have a suspension idea. I usually have 2000k to 2800klbs in the bed of my truck. i used to have a 08 ford f150 crew cab fx2 that did a good job holding the weight. now i have my 10' ram big horn and never put anything in the bed yet. My qwestion is can i cahnge my springs in the rear for...