At Camp Mustache this year, there was a fair amount of discussion around this concept - house swapping, or couch surfing with other MMMers. This thread and associated spreadsheet definitely show there's some interest in the idea. Have many people successfully negotiated a trade?
I thought about putting a bit of effort into creating a minimum-viable-product website that would basically act as a couchsurfing/AirMnM directory but for Mustachians, but I am not entirely sure if there's enough demand to warrant the effort. Improvements over the spreadsheet would probably include a map, and searchable results.
I think there may be a variety of people who have an extra room, couch, or even driveway to park an RV, who wouldn't mind meeting traveling mustachians and hosting them, what do you all think?