It's pretty trivial to range extend a gas vehicle within reasonable limits. Gas cans had a lot of development (the shape and features of a modern metal gas can came together in the 1930s), but any container sturdy enough and sealable will work. In a model T, fuel was fed by gravity, so tank capacity is strongly limited by where you can put the tank. On a vehicle with a fuel pump, there would be more flexibility (my first car had a 33 gallon tank... if you combined that with a fuel efficient powertrain, the range would be huge)