While waiting for the snow to melt, I try to pass the time by reading this forum and especially this thread. I posted a while back that I bought a used trailer and used it last summer. It was great other than I could only carry 2 kayaks and a cargo box. Here is a pic of my original setup. It was a rack setup on the bunks of the trailer.

I wanted to be able to put bikes and camping gear in addition to the 2 kayaks. I also wanted to be able convert it to a utility trailer if I wanted to go to home depot and pick up some wood. I decided I would need a second level to the trailer to hold all that. I removed the bunks and added floor to the frame of the trailer. I looked into some kayak racks that are designed for small boat trailers. They ran about $250 to $400. More than I wanted to spend. I found a ladder rack to be the solution. I bought one for $60 on ebay. It took me a few hours to figure out the best way to install this onto my trailer. This is the end result. I put the kayaks on today to make sure it all fits. I added some iron piping to the bottom for my racks to hook onto.
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Room for the bikes in the middle of the top rack
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I bolted the ladder rack to the frame of the trailer.
I think it turned out pretty good and can't wait try it out this summer. When it is all said and done, I spent about $330 for this set up. As always if you have any other ideas please share them!
Jeff