Tom, Almost at any large (industrial) plumbing supply house. Not "Home Depot!!! Some dealers will cut a 20' stock length in half and sell you a 10' lenght. This works well as you will only require 10'. For securing the PVC, I personnaly used adjustable pipe clamps. I use 2 lengths to get around the circumference of the larger (10") pipe and one for the smaller (8") one. However, I do use 6 complete sets of clamps per tube. Three in the front and three in the back. I know that some people use 1/4 inch round or flat bar w/draw down hook bolts (or whatever you call them
) but that was too much work for me.
As for strength, they've been tested. I can't say what would happen if the trailer were to ever impact in an accident (actually, you couldn't say what would happen with tubes w/the heavier anchors either) but I was cut off one day just as the light was changing. The delightful person in front of me slammed on HER brakes so she wouldn't run the light after I had already assessed that I was going to make it (had SHE not cut me off). Needless to say, I had to slam on my brakes as well to keep from hitting her. As I was waiting for my car to stop (hopefully before hitting her) I could just sense that everything on the trailor (including the boat) was going to come crashing through my back window and the mast was going to shoot over my car like a Titan missle at any minute. Long story short, there was no impact and the only thing that moved on my trailor even little bit was my boat. Whatever you use, I'm sure you'll come up with something safe. "Bottom line!!!!"