I need help coming up with a simple and cheap solution for a seatpost attachment. Hopefully this is the right thread.

I found a weird bike trailer today while riding over to the girl's house, and now i need some advice on getting it to work. i literally know nothing about trailers and hitches, which is sad because my job is riding around pulling a pedicab trailer all night.



One concern of mine is the axle position: it's right at the rear edge of the trailer. That means the weight of the load will be on the tongue/hitch, correct? I want to balance the weight over the rear axle (slighty forward) 60/40, right?



Any suggestion as far as hitch? I'm not sure how to make a mount for it to clamp onto my seat post. The picture shows what I am working with (those pins were used to mount the weird plastic body to, well, nothing actually. They may be useful yet).



After I pulled the body off and made sure the frame had no cracks, I ghetto rigged a seat post mount and went out in search of some scrap wood to use for a base. No luck though. This set up was SUPER SKETCH. **** just bounced around, like I sort of expected.



*I want a garage/work shop so bad*

My plan for now is to bolt some 1/2" plywood down as a base, extending out past the axle by about a foot. And of course, clean up and repaint the frame and wheels and make it look presentable at least.

So, if you have any suggestions for seat post attachment, please let me know.