Source for horizontal propane tanks

I've owned several RV's in my life that had horizontally mounted propane tanks.  Now that I am building a food truck I'm trying to find two tanks that are 100# tanks.  Any help would be much appreciated.

Made by manchester tank . Any LP store should be able to order you one in. Same as any RV parts store.  I think they would have to special order it (there should be a Camping World around I-10... I think it's on the west side of town if I remember correctly). I don't think you will find a 100LB horizontal tank. Manchester now shows 30# is the biggest they have. DO NOT confuse a fork lift tank with a propane tank that you use to operate LP appliances off of. E-Mail Manchester Tank or contact you local LP outfit. I'm not sure about tanks for vehicle engines. You certainly can't lay a vertical tank down on it's side either.  Someplace like Ferrel, Suburban or Amerigas should be able to help you (those are the big names) . I have a 40# in my Class C and I know a guy in N. GA who has one for sale (same size). You might want to check out Craigslist and similar places if you will tank a used RV tank..

there are a couple of guys on ebay with a selection of manchester tanks...i think the largest one i saw was 24 gallon(100#)