I have the 4 gallon can. It slides under the roof rack on my off-road blazer.
In the heat the fuel will swell LOTS and crack the cap and/or swell the tank so bad you can't get the holder to turn so you can't vet the tank off of the back of the vehicle without having to loosen the cap and spew fuel everywhere under pressure.
Twice.
I have since milled an aluminum cap to fit and I don't use the through holder.
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