There are businesses that rent space for repairing vehicles. The one's I no about probably closed during the pandemic.
The best way to get something like this going would be to find a location where there is local support for a community garage. The site could then welcome the traveling community.
The problem with travelers is that travelers, by nature, aren't interested in building up local businesses; so you would find the local community subsidizing the traveler community.
The problem is the local community does not care about the travelers and it is hard to get support from them. Thr travelers seem to want a handout and do not really want to build a community.