Yep, a pintle hitch trailer (tow ring rather than ball hitch on the trailer).
Methinks the rusty old WDH drawbar with ball is actually installed in the vehicle receiver, with the trailer tow ring set over / 'hooked' on the ball.
Looks like the muffler clamp and inverted loose drawbar 'clamped' on top by the jack are all attempts to keep the trailer tow ring from jumping off that ball.
It'd take one heckova bona-fide emergency need to move that trailer a very short distance to try that 'rig' ILO getting a proper pintle hook drawbar for the vehicle.
But then, if doing a one-time slow shuffle of the trailer 1/2 mile down a rural road to a neighbor's place .....