When I was a kid riding in the back was not that cool unless you were sitting on the folded down tailgate. Cooler was to be standing on the running board holding onto a mirror or something inside the truck. Five to six miles on the way to school was not a big deal.Until the 80's or so it was common place to see kids, little kids, riding in the back of pickup trucks too so that would not be far fetched. Don't know that i would want to be sitting on top that gas tank if you get rear ended!
A few years back I wanted to buy a 50/51 F1 like my buddy drove in HS. We car pooled to school and four of us sat in that cab. Although the 4 of used to get in the truck with one guy sitting on the lap of the guy in the middle I never realized how tight it was. The guy sitting on the other's lap was also responsible for shifting. 50 Years later I found one and took my kids out to test drive it and damn it was tight!