Difference between rear stock trd bilstein hd shocks vs rear bilstein 5100

I have 5100's on a GMC Duramax and my '95 Tacoma, I would swear by them. I replaced the front coils and rear leafs on the tacoma and have 5100's all around. It rides great and sits level with a 2" body lift. The 5100's have been on my GMC for two years and I've given them a real beating on the roads up north. The only difference between the stock shocks and the bilsteins is when I put my cargo trailer on the truck it drops more than the stock shocks. As far as I know the bilsteins are the only shocks on the market that are warranted if you leave the ground. I haven't tried this intentionally

 

They gave me 1 9/16 on the driver side and 1 13/16 on the pass side . I wish I would of put the 1/4 in spacer for the taco lean .They give an awesome ride !