As far as power accessories go, I wouldn't waste time trying to retrofit the hydrovac brake system. The brakes on these trucks are not difficult to use and really don't require any undue effort to stop the truck.

Adding power steering would be a lot more useful and beneficial, I think

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)