Never in one war movie, museum, history book, TV show or textbook have I seen a picture of a fuel tanker from this era. I've never heard it discussed either. How was fuel transported to the front lines, especially in the cases of mechanized divisions like Patton's or Rommel's?
Getting fuel to the troops that landed in Normandy was an interesting challenge, and one that required a lot of preparation, planning, and innovation (who would have thought a chemical engineering background would be useful on /r/AskHistorians?). The whole project, which was codenamed Operation Pluto, was devoted to developing the materials and techniques to lay an underwater pipeline across the Channel quickly and effectively. According to the textbook from a graduate seminar in polymers (it's not a history book, I know, but I'll try to find it so I can check the citation) one reason the Nazis didn't think a Normandy landing was possible was the lack of a usable harbor to allow large fuel tankers to dock. The Allies of course knew this as well, and developed a lot of new materials and techniques to lay an underwater pipe to provide fuel.
Wow, I'd never thought I'd more or less qualified to answer a question here. Source: I have a healthy interest in WW2 and own an WW2 era american military vehicle. I regularly attend gatherings of such vehicles.
The keyword you'll probably want to google on is the 'Red Ball Express'. This was the name given to the whole of thousands of GMC CCKW trucks and several routes to transport fuel and other supplies from the Normandy invasion beaches onwards to the front. Better read on it here on wiki and here.
Fuel was indeed mainly carried in Jerrycans. Fun fact: the name 'Jerrycan' points to the original German design for a fuel container. 'Jerry' was a derogative name for German soldiers, so a Jerrycan is nothing but a can used by Germans. The original fuel containers of the British forces were called flimsies and were very impractical. After capturing 'Jerrycans' in North Africa, the Allies were quick to copy the German design. Read more about that here and here. The US adopted a slightly different version though, seen here. Every Allied military vehicle was standard equipped with at least one Jerrycan 1 2.
Apart from Jerrycans, fuel was also carried in barrels, in tanker trucks 1 and 2 or trailers.
