On the Advanced Design Pickups, the battery was under the passenger side of the cab floor. To protect
the battery from road debris (gravel, sand and ice) it was important that it be protected from this coming
from the right front tire.
Designers of the Chevrolet and GMC installed a metal plate riveted in place. A simple extra to what
might have been a problem to customers.
(On the 1946 and older trucks the batteries were only protected by their partial tray.)
1950 GMC 1 Ton