Sulastic Rubber Springs, Greatly Improving the Ride of Trucks Install review by H. Kent Sundling, edited from PowerStrokeOnline.com Like a torsion trailer axle or Hendrickson suspension on a semi-truck, Sulastic Rubber Springs are a cast hinge embedded with rubber and they do settle the empty ride down considerably. I have a clothes rod attached to the hanger hooks in my … Continue reading Sulastic Rubber Springs Cushion helper for trucks, vans and SUV’s