My 0.02 is that you can fix this with an airbag as mentioned, however the spring is weak. I would replace the springs and then if you felt you wanted future control and ability add the airbags. But that is just my 0.02. A lot of people here have reported very diffferent costs in having springs done. In my case I was able to get both done for less than the dealer wanted for one. I went to a spring shop that handles all of the large vehicles here in Rochester (and I do mean almost all of them, from firetrucks to big rigs to SUVs like mine).