What he is saying is you measure the width of the frame rails under the rear of the bus, then you find a class 3 hitch of the appropriate width for that frame. Cars usually have fairly specific hitches, but buses are just medium trucks so most truck hitches will fit. If you're going to a shop anyway they would take care of that for you. Otherwise you might be measuring hitches in junk yards or ordering one and not being sure if it will work.
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