Looks similar to the old 25K McCall air ride hitch with a Pullrite head and rocker assembly.
The slide mechanism could be an add on, because I did not have that feature on mine but that was over 5 years ago too.
Definately a high $$$ hitch if the bags and lines are in good condition, and it comes with the compressor, relays and gauges . . most likely $2K or better with the slide feature.
Kevin