I believe the roof rack is rated at around 100 pounds. As far as adding that much weight up that high...it would derinately not be a good thing. Just ask the guys that have their spare tire, which weighs a third of your expected weight, how much they feel it up there.
Some of our overseas owners have done LPG conversions, maybe they will chime in.
Also placing a fuel tank on your roof would probably violate some safety laws in most states.
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