I decided to pull the trigger and buy the Harbor Freight 4X8 trailer. $294.
The first thing you have to know is that it is not the same as putting an Ikea shelf together.
Having a mechanical understanding is mandatory. For example, if you wire the ground wire to the trailer frame as directed, obviously no lights will work, as everything is painted and there are two hinge points that will not conduct very well. So I basically re-engineered the wiring, using dedicated ground wires for everything and loom for protection:
I also properly packed the wheels bearings with fresh grease as there was only a minimal amount in the bearings.
Overall, I found the quality to be much much higher than I expected. All I need is a sheet of treated plywood and I will be set!