I have two 12" pieces of 10' long, double-walled, corrugated culvert pipe, having purchased the 20' piece for $75. I was very happy to find it.
I made custom sealed end pieces and ratchet tie them to the deck of my trailer.
This should help:
https://lh3.googleusercontent.com/-ptkj ... 1-1349.jpghttps://lh3.googleusercontent.com/-sKO_ ... 1-1349.jpghttps://lh3.googleusercontent.com/-L5f7 ... 1-1350.jpgI think the boom boxes and toy boxes are awesome. More money than I spent but they are ready to go.