I wanted to make a trailer that's easy to print, requires as few off the shelf parts possible, can be easy to modify to fit anything you want to tow. Planned mods: gooseneck version, enclosed version, boat hauler, leaf springs, triple axle, ramps, and ????

Given this will be used outdoors, store in hot vehicles or possibly in water I'm printing in ASA-CF as this is what I have on hand.

Off the shelf items needed: (US Amazon links)

bearings 2x each axle - https://a.co/d/2tZ4nu4

threaded rod(M2) 1x per axle- https://a.co/d/bbpkt0K

M2 nylon nuts 2x per axle- https://a.co/d/cfcr8GM

2mm rod used to help make hitch or optional deck insert stronger- https://a.co/d/3drEoXz

Hitch used on my truck and what I used as a reference for ball mount on the trailer- https://a.co/d/3BXLvfG