From 1983 brochure:
In order to easily and comfortably transport the Tour's ever growing visitor population, Universal Tour asked Winnebago to design and build a versatile and durable, yet comfortable, people mover. With the assistance of Tour transportation specialists, they devised the Super Tram® - the world's largest free-moving gas-driven road vehicle. Super Tram® has a passenger load of 175, 33 percent greater than their predecessor the GlamorTrams®.
The Super Trams were originally signwritten "Universal Studio Tour". Around 1990, when Universal Studios Florida opened, the trams were repainted with "Universal Studios Hollywood".
Thanks to universalstonecutter for additional research.