These Harbor Freight trailers seem to be a favorite among the touring bike owners. IIRC, there is a list of "upgrades" folks have done with these to make them "outstanding" trailers for the $$.
My opinion...I want a much narrower trailer. Something that will fit in the "slipstream"...with only one wheel.
You are going to pay a HEAVY premium for one of those as they are A LOT more expensive than the HF trailers...