Could be right. Arent the typical LPG cylinders for gas heating/cooking of the 10kg and 45kg variety or similar?
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Yes it is, forklift tanks have the take off below the liquid level, whereas BBQ tanks have it at the top where you are getting vapor out.
Liquid will mess with the cheap regulators that consumer gear has on it. Assuming they can even get it to connect since the connectors are totally different.
Same reason you cant use a car LPG cylander to BBQ off, I believe there are regulators available but when I asked I was told the usual carryon about not legal to store a forklift cylander at home etc etc. rathar than a helpful solution to cooking at about 1/3rd the price.