I added a pair of overload airbags on the rear of my truck. In so doing I had the rear end jacked up by the frame with all weight off the rear wheels. Since then the truck rides like I have no shock absorbers at all regardless of whether or not I have air in the bags. When I'm on rough or uneven road it's continually bouncing. A pothole hit produces a jarring thud. Is it possible that taking the weight completely off the suspension like that somehow damaged my shocks?