I towed bikes behind my subarus on a folding 4'x8' harbor freight trailer. I'd much rather have had a bike specific trailer, but the flat deck came in handy for all sorts of fun I probably already posted in this thread years ago. The trailer folds and stands in my garage so that I can still get two cars in there too.
I just welded up a 2" receiver tube to my utility trailer this weekend to add a removable winch to it for hauling things onto the deck. I can also use the winch in the receiver on the back of my truck. It's pretty handy.
Here's some video of the buggy since I show it off a bit in the video. I built it in 10 months in my garage. It's my current toy and a great welding project.