This might inspire something. Its on a S10 chassis but if you notice, he did use the filler location in the cab & the factory S10 tank in the chassis.
This link is below, there's more pics there too.....

https://bringatrailer.com/listing/1951-chevrolet-3100-pickup-2/#comments-anchor

Amazon sells the tanks for $120 ( w/ free shipping)
Comes with 20 gallon capacity. Get an exhaust shop to bend a stainless steel exaught pipe ( or 2) & use the factory fill location.
Attachments
1951_chevrolet_3100-pickup.jpg (301.73 KB, 155 downloads)
1951_chevrolet_3100- pickup bottom.jpg (293.71 KB, 129 downloads)
20240704_131347.jpg (180.29 KB, 48 downloads)

Last edited by festerhairball; 07/04/2024 8:20 PM.
1959 3100, original 235/3 on the tree w/overdrive. Carter YF 2100S carb, 205/75/15 w/front sway bar