Hidden Hitch doesn't have a confirmed fit listed for a 2003 Workhorse W22 Chassis so if you do have one I'm curious how it was mounted to the frame. If you could send in some pictures I'd be happy to take a look.
The alternative to this would be to go with an adjustable fit hitch like the Draw-Tite Ultra Frame Service Body Trailer Hitch Receiver # 41990-16. This can be cut to fit the frame and will need to be welded on. It has a 16,000lbs GTW and 1,600lbs TW, but you'll want to check... view full answer...
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