You have quite a few options there Matt. With your vehicle you can look at buying a helper spring that rides on the top of the leaf pack which can add 2500 LBS capacity I'm guessing around $400 , upgrade your leafs to HD springs rated for 3300 lbs which all new hardware and springs about $600, I know of something called a Timbren that will pretty much hold up anything just that you lose your ride and its more stiff when there is weight in the back these are rated for 6000 cap. runs about $250 and you can go with airbags but looks like only 2k lbs bags are available for this truck which would run you about $350.