My dad has an 03 Tundra, and the only problem he sees with it with his usage is that the bed sags under load, and compresses the shocks all the way. He owns a restaurant and an HVAC company so he's constantly hauling food/furnaces. Anyways, i briefly looked at some threads on tundrasolutions and concluded that what he needs is an add-a-leaf kit (i don't know much about truck suspensions, just small cars ). He's not looking for too much of a lift back there, just something that'll keep the bed level when he's picking something up and has to drive across the state. Any brand recommendations as far as add-a-leafs go? Also, would airbags be a good idea as well/instead? Thanks.