I am thinking something like stock springs from and rear with some gas shocks in the front and air shocks in the rear for height and load adjustment.without knowing how old(or what)your current springs are,a new set of springs and shocks will do wonders.spend as much as you're comfortable with on the shocks,they're the brains of the whole operation.even cheap replacement shocks will change your current situation but depending on what your goal is will decide on shock selection.