Newport Engineering makes an electric unit they advertise for the light duty trucks. I believe I have seen a listing for the Task Force years. The various vendors sell them for about $200 bucks.
I bought one for my 51 about 15 years ago and it was a bolt-in. Works well, though I wore out one switch coping with drizzle so I bought the delay switch.

1951 3800 1-ton
"Earning its keep from the get-go"
In the DITY Gallery
1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.