want to add a mild lift to my psd (4") just to add looks to my 2wd psd. besides getting rated tires for tow/payload will a lift screw up my payload/tow ratings. i mean its just for looks i will be towing and putting rock and sand in the back for home remodeling project. i see some lifts change the leaf springs some just add blocks, is this an issue? finally how about some recommendations on brands. my truck was bought because its a "super-duty" it needs to stay a superduty