Carry-on trailer
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#5
The 5x8 size is the most common of the smaller trailers out there. Anything larger than a 5x8 would probably be too heavy to tow around easily with a quad once loaded. An empty 5x8 trailer can be easily moved around my hand as well. A 5x8 is probably what I would look for. You can add wooden sides to enclose it a bit better so your stuff doesn't fall out if you need to and that won't add much extra weight either. Basically a 5x8 trailer is roughly about the same size as a full size truck long bed just with shorter sides.
#6
I have a side load atv trailer that I had made when we had two atv's. My UTV fits on there nicely so I had no reason to trade trailers. It is about 7' wide x 9+' in length. I have used it many times to haul stuff behind my UTV. Trailer is a little big for maneuvering in tight spaces so I also have a small trailer if needed but that one is way to small to carry my UTV.