Steel or aluminum would be best, but I remember my Dad and later myself hauling a lot of eave spout, gas pipe and lumber as well on racks made with two by four uprights with a two by four crosspiece bolted together. Ours stayed on until they rotted, but they are easy to put on and off. Plus, it would give you an "old school" look. Back in the day the only store bought racks I remember seeing were on trucks with store bought side boxes. John
