I read somewhere that on D-Day there were about 5 Million jerry cans available, by the time of Market Garden only about 1.5 Million could be found. I've also seen pictures of Allied vehicles with German Jerry cans on. If it works use it. One guy I know in Jersey has a Wermacht Jerry can on his vehicle, when I asked him why, he told me it was a family heirloom, his Dad had nicked it on Liberation Day.