There isn't anything specific for your Chevy Mid Bus but there is an option for a universal, adjustable weld-on hitch.
For example, if your frame was 18" to a maximum of 60" then you could use the Curt Class 5 Universal Weld-on Hitch w/ Brackets # 15903.
I have added a link below to our entire selection of weld-on hitches for you. view full answer...
In order to meet your measurement requirements you are going to need a universal hitch like the Draw-Tite Ultra Frame Service Body Trailer Hitch Receiver # 41990-16. This hitch will need to be welded on for installation.
The hitch fits frames up to 44" wide and uses a 2" receiver. It also has 16" tall welding brackets which can be modified to give you the desired height. These brackets are long enough to allow you go get the 12" distance from the bottom of the frame to the top of the receiver... view full answer...
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