Can anyone ID this trailer hitch

[AMK1001]

Does anyone have any info on this hitch?
It has two big springs connected to it in between the frame rails. There is a slot cut into the rear bumper where the hitch comes out. There is a lever that hangs down below the bumper on the left side that I haven't figured out yet. What is this designed to tow?

Thanks,
Aaron K

[Irish_Alley]

someone else i think had something similar to that
http://forum.73-87chevytrucks.com/smforum/index.php?topic=10145.0

[zieg85]

Looks to me a DMI Quick cushion hitch for hauling grain wagons

[VileZambonie]

http://www.unitedtruckparts.com/products/quiccushn2.htm

[werewolfx13]

Zieg hit the nail on the head. Its for pulling grain/hay wagons. My 87 v20 had one in the bed that had been taken off just after it was purchased from the pig farmer that had bought the truck new.

[AMK1001]

Very cool. Thanks for all the info.