>Actually, vapors or fuel from any leak while driving would quickly be left
>behind.  In the event of a crash, the tank would be extremely protected by
>the tire 'air bag'.  In any event, the amount of fuel (~1 gallon) is very
>small.

It's the qualification "while driving" is what bothers me... so it's okay to
have the vapors build up while the Van is sitting in the hot sun.. and then
you come and start the thing and a electoral short in the radiator fan
and...... Kaboom!

also.. "the amount of fuel (~1 gallon) is very small"

Ahhhh... I could be wrong, but I think Molitoff Cocktails were made in 1
liter wine bottles, no? :)

Bill