http://www.ebay.de/itm/Super-Foto-Kamer ... 231c2272d0
This is the rear end of a leichte Entgiftungskraftwagen (Sd.Kfz.10/2) which was designed to spread decontamination chemicals over ground that had been effected by poison gas. A requirement left over from the WWI which fortunately was never needed in WWII. The piece you see is the spreader.
If you want the full history of this vehicle and the other two "poison gas vehicles" with all the usual high quality photos and even four view drawings by Hilary Doyle you need to get hold of Panzer Tracts No.22-1. This is the only publication which covers all the variants of the Zugkraftwagen 1t and not just with a few grotty photos.