I would not believe posted weights as they have been wrong in my experience. Towing without the W/D hitch is possible and I did it once when the trunion bar pin failed. I was doing an 03 Ram 2500 pulling a 36' TH with 4 ATVs in it. We pulled over two passes and one had light snow on the ground. Lots of pissed off people behind me as I was going very slow and careful. Never got near anyone in front of me and stopped several times to look the system over.
I just wanted to say from experience it can be done but, highly not recommended. Slow is the key.