yeah I'll admit I was not even thinking I'd ever have enough weight to get the back end light. I was thinking it would "teeter" left and right in the front because I was higher up. I thought of pvc too (now anyway!) mine was made of free material that jumped in my truck off of job sites here and there. all I have in it is time so I'm not too bent up about it. I made it out of two 5 foot sections of ladder rack for a pick up truck and just cut the legs to the length I wanted. with the plywood I think I'm right around 100 pounds. If you made one out of pvc would you try and make it with a floor truss design like you did on the wood one? or have you thought of anything yet?