The 55-59 Panel and Suburban's had their tank between the drive shaft and the frame. They are straped between two of the crossmembers. I'm not sure it they did it that way in '46...
Have you checked out Tanks Inc.?
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD