FYI The fullsize Van tanks are quite similar to the RamCharger or may be the same, when you are looking thru a junkyard. My 72 B300 Maxiwagon had a 24 gal metal tank IIRC. Been gone about 22 years.

Every electronic device is manufactured with smoke stored deep inside... only a true genius can find a way to set it free. The most terrifying words in the English language are: "I'm from the government and I am here to help!"