Another critter you may potentially encounter in your quest for a jeep trailer is the G518 - also called a Ben-hur because it looks like like a chariot and was made by the Ben-Hur MFG. co.
The G518 is a lot rarer than M101s, M105s and eve M416s.
It's bigger and heavier than a 416, listed as a 1-ton capacity with a 4x8 bed, 18" sides, 20" wheels off of a deuce and a half but it still pulls ok behind my unlimited.
I did take a couple of leaves out of the springs to soften it up some.
I snagged mine in fairly decent shape for $250
great thing about TX - rust isn't usually a problem!
The main problem is the wheels - theyre the old 2 piece split ring wheels - also called widowmakers because if the ring isnt seated just right when you goto air up the tire, it will pop off and potentially decapitate you.
Stockton will make modern wheels for it, just havent had the extra cash to throw at it yet.
I turned mine into a camping deal - military indestructibility, parking brake etc made it a good base to work from.