No mobile liquid tank should be built without proper baffles, the stress from unrestrained liquids acting on the tank walls and seals can be substantial. I noted in some video of the French operations in Mali that they had a fuel bowser based on a HLVW sized vehicle supporting their light armour and topping vehicles up directly along with filling cans. Not a containment liner in site, but they looked a tad nervous, running a fuel bowser in such a conflict sure makes you a prime target. One of the ideas I toyed with back in the "thunder run days of Iraq" was a Stormer/LAV set up, basically a LAV with no body behind the commanders hatch and flat deck with palleted stores, including lightly armoured fuel tanks that could be jettisoned from inside in case of fire.