I want a 5-10#, haven't seen where those are made yet.
What about the 10 pound Lite Cylinder, as discussed in Propane Tank Sizes
? Donna, you pointed us to them... is their 10 pound not available?
By the way, I recently read an article in a 4x4 magazine about using propane
(for engine fuel, not camping) in off-road vehicles, and their example used one of these translucent composite tanks, in the "forklift" style (removable, horizontal mount).