I am planning on building a 3 point hitch carrier for my tractor. The local farm store has the frame and it is designed to be used with 2x6 boards. I have seen some picnic tables in parks and rest area made with dense plastic boards. Some of it looks like recycled bottles. Looks very tough.
I am thinking that such boards with stainless steel carriage bolts would make a tough long lasting carrier. Anyone have any experience with plastic lumber? Any recommendations as to brands etc?