Well, thanks for the useful information. I do need to add, the 62 frame is considerably different. There are 2 crossmembers just rearward of the axle. They are only 12 inches apart and roughly 15 inches from the 2nd crossmember to the frame end. This was my problem in locating a tank to fit. But I have, I'm installing an aluminum fuel cell, 30long x 12wide x 9high. Roughly 15 gallons and should provide an ideal fill point in the bed floor. Once I get it installed I'll share some photos.
