Any recommendations for a place to look for an enclosed cargo trailer?  "Previously owned" would be OK.  Looking for something roughly 6'X6'X6-8'

Here is a place in Tucson to get started.

All things used seem to be at a premium right now, at least this place is on the North end of Tucson if you need to travel down.  I shopped a few different places here when I needed a car hauler and this place was the best deal for what I needed.

I picked a PJ trailer, which had most of the features I wanted.  Even before the chinaflu games, I often found used car trailers priced higher than what I bought mine for brand new, with new tires, brakes, and bearings. If you buy used, you are probably going to need those things.

I dropped my truck off, went to lunch, and came back with my trailer hitched up and the brake controller installed.  I am happy with them.