I just completed a total remodel of a training cart I built 3 years ago.
The main frame sits on a slider rail to compensate for various loads. The seat also slides for fine tuning.
I added the extension in the back to turn it into a weekender instead of a day tripper. I took out the wood floors & dash board and replaced it with expanded metal. I re upholstered the seats with cordura material. Added a new paint job.
The shafts come off and a pole can slide right in.
The pic uploader doesn’t seem to be working. I have it on my website. It also just happens to show some before pics. All of the wagons on the page are home made either by me or friends. In 1 case a joint venture.
http://www.lenzpaintquarterhorses.com/drivinghorses.html