And another. What could possibly go wrong? Maybe they are recreating the Burning Man Festival?
Couple of points:
Why wouldn’t you put in in the back of the car and fill it there? Saves lifting it as that is still going to weigh 30kg(ish)
How much will he actually get home? Once that liquid gets moving, even if it is a shallow fill, that is going to fill the car rather than stay in the container. I assume that car manufacturers learnt that it is best to have a locked lid on fuel containers.