Would a stiff shock cause the bed to bounce on the highway between 40-45Mph? I have a 97 ECSB with 1" blocks and nitto terra graps (P)285/70/17 shocks are Bilstein HD's I carry a 70lb spare tire in the bed next to the tailgate so there is weight in the bed but when I loaded a couch it rode so much smoother. Tires have all been checked and balanced . So I'm just wondering if these shocks are a bit stiff for the truck with lil weight in the bed...