I am looking for a cheap small (4x6 or 4x8) utility trailer. Max around $300.
I am in the process for some major yard work and I need to haul some dirt, soil, mulch, stones, tools....
I just don't want to mess up the inside of my truck. Does anybody know where to get one in the DFW area? Preferable a used one. I don't really want to spend more than $300.

I have seen that TSC, Harbor Freight and Northern sell these "Haul Master" trailers. You get the frame with lights and wheels for +/- $200 and add the plywood yourself.
These ones:
http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=90154

But I wonder if they are any good or just cheap stuff with bad bearings, crappy welds, ....

It will be mainly used to haul stuff from the local hardware or garden center. I am not planning any coast to coast trips but may use it as well for camping trips.

Thanks
Stefan