Lift blocks do a great job at adding height, but they don't increase load carrying capacity at all. For a little more height and greater strength you'll need ReadyLift Off-Road Suspension add-a-leaf kits. These kits add an extra leaf that stiffens the pack for added height and capacity. Whether you want to increase the rake of your vehicle or provide a little help for towing get ReadyLift Off-Road Suspension add-a-leaf kits. Kit includes one pair of rear add-a-leaf springs and two center pin bolts.