Thanks for replying. Now wondering if I should have the air bags checked before the shocks replaced, because maybe it's not the shocks, the expensive mechanic is the one who said to start with them. The person I bought from said he had the air bags checked or worked on before I bought and I think I have a receipt somewhere for that, but the mechanic who did that is in another state. So is getting the air bags checked the place to start? Is a truck mechanic the best person to check that out or any mechanic can do that? If it's still swaying a lot and it's not the air bags anymore and the back i