leaning super c

I Have the 07 GS Endura 6340. I bought mine new and when I got it, it to was listing to the rear r/s. I never thought to take it back when it was under warranty. As time went on it worsened. Mine was off by 3". I never drive with my tanks full other then fuel. Last year on the same side I had both rear tires blow out on me which was caused by this problem. I finally to it in to an alignment shop who fixed my problem by adding another leaf spring which corrected the problem. They did a true realignment on it. I had taken it in a couple years back to another shop for alignment (front tires were wearing bad). Shop said they did what they could and that Kodiak was a Chevy problem which Chevy had to fix. They also said it was a notorious problem. Well they were wrong (wasted a few hundred $$$). The second shop which added the leaf spring said the wear on front tires and said it wouldn't align correct due to the rearing leaning to one side. Well, it's all good now, all aligned correctly and level rear and front. It sure made a difference on the road, very little swaying as from the day I bought it new. Handles the way it should be. We paid a little over $900.00 to resolve but well worth the money, good luck. Oh it's not as bouncy as the day we got it, smoother ride. Happy Glampers..