Be careful about the NON waterproof lights that come with this trailer! I have burnt out many bulbs putting my boat in the water!!! Now investigating waterproof housing!
Another option for a similar trailer for the 'fish is to use a 4' x 8' trailer from Home Depot (built by the same Taiwan outift that Harbor Freight sells).
Install a sheet of pressure treated plywood as a base (so that you can also use it as a utilty trailer). Build and install frames or perpendicular bunk boards and fit them into the brackets along the trailer meant for the 2x4's for the uprights.
I don't have trailer issues (no trailer), but why not buy the cheapest Harbor Freight trailer—cut and weld (or bolt) an extension to make the tongue longer?"...The shortcomings are a very low tongue weight, and significant rear overhang..."