Have a look at an ex-army trailer, they have LR stud pattern, rear tow point, proper springs with shocks, easy to extend single round drawbar, I'm extending mine 18" to give me some room for spare on drawbar. Heavy though at around 300kgs for bare chassis (no body), but will never break, am considering setting up chains from front corners of trailer to Disco so as I can back it without trailer turning off straight back, so as it will not jack knife while backing down a slope, still on the drawing board with that one, show you a pic of my bare trailer, if I can find it, Regards Frank.
https://www.aulro.com/afvb/images/im...013/05/388.jpg
https://www.aulro.com/afvb/images/im...013/05/389.jpg