Terry,
I plan on boxing the frame from the front cross member all the way back to behind the transmission cross member and maybe even further.
Will probably use some 1/4" or 5/16".
Rear cross member will be something similar to this:
Rob
Mountain Springs Power Wagon Service, Paso Robles, CA
1962 W100-340-LU2 winch
1964 W200-340-LU2 winch
1964 W300-318-LU2 winch
1965 W200 Crew Cab- Cummins Diesel