my 85 elky seems to ride rough and im thinking a new set of shocks and springs all the way around.. are the air shocks for the back a good choice for elkys..also do they sale springs with different ratings so i can get the car to sit a little higher off the tires.. it looks like where its old that the car has settled over the years.. im wanting to get it back to specs and also be able to drag a small motorcycle trailor behind it...thanks for any insight..