A leader, either hired or chosen, who guides a caravan of recreational vehicles on a trip. The wagonmaster usually makes advance reservations for campgrounds, shows, cruises, sightseeing and group meals. Found on https://www.encyclo.co.uk/local/23310
1) Sickly-looking overlord 
A leader, either hired or chosen, who guides a caravan of recreational vehicles on a trip. The wagonmaster usually makes advance reservations for campgrounds, shows, cruises, sightseeing and group meals.