I have an 02' ZR 6 Cross Country... The sled has 1000 miles and I rebuilt the rear shocks at 250 miles. At 500 miles had the update completed on the dial adjust / front A arm shock. I weigh 165 lbs and I ride the sled aggressively... I broke a couple block so I removed both until I could replace. When I went to move the sled I noticed that the sled was sagging so I pulled up on the rear bumper and it came up about 6". However, I could push it all the way down with ZERO rebound. I had to pull it back up for it to not stay compressed? Any ideas, recommendations, suggestions to eliminate problem in future (Note: Without having to buy a new sled...)???