not what i had bargained for

[wellcraftv20step]

just bought a new dodge ram 1500 quad cab with a 4.7, i was loving my truck till i put a cap on and put about 200 lbs of tools in the bed. i would tthink about 400 lbs total. Now the rear of the truck looks and feels like it has dropped about 4 inches.I knew dodge had done away with the leaf springs and now use the coil for a better ride ,i guess this is what dodge did when they figured out that the majority of people now buy this truck for looks and not work! i guess i,ll have to put in a heavier spring to correct this. oh and i can only imagine what will happen when i hook the v up to it ! if anyone has any other ideas on this please feel free.