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The sign accompanying the trainer.

It reads

Rover Training Vehicle

The Rover on display is a training vehicle designed for use only on Earth. Since the Earth's gravity is six times that of the Moon, the "1-g trainer" had to be heavier and stronger than the actual flight versions. While the trainer's wheels were made of rubber, the Rovers driven on the lunar surface had wire mesh tires.

[captions for photos on sign]

(Left) Apollo 15 backup astronauts Richard Gordon and Harrison Schmitt practice deploying the Lunar Rover with a training vehicle ad Kennedy Space Center.

(Right) Astronaut Richard Gordon adjusts a motion picture camera mounted on the Lunar Rover training vehicle.