UPDATE: Still Available.
(05/22/2020) There could be value here.
https://www.facebook.com/marketplace/item/237003434027074/
“I have 2 hobart GP-258 generator welders for sale both complete the one on the trailer has the arc sense throttle linkage NEITHER OF THEM RUN but wouldn’t take much to get going both engines are free and have compression uses a Willys CJ2A engine parts are easy to find at any auto parts store just lost motivation. Trailer included sells as a set will not separate”