Jeremy,

The 5 gal jerry cans carried on the turret bussle were for water. Would serve no purpose to carry that small amount of gas open to hostile fire. Water and gas cans have different filler caps. Water cans had a simple cam activated latch that closed the cap to seal it. Gas or oil cans have a threaded cap that screwed in which allowed you to use a hammer or bar to close it tight. In WW II many can were marked with a white cross to denote water. This simply helped to quickly ID the thousands of cans that were dumped off and swapped for full ones, at supply stations, but no longer in practice. Cans with engine oil are normally positioned standing up and strapped or roped somewhere to the chassis. Seals often get damaged or worn so they are not tight. Laying them down will cause oil to leak all over the tank. Not only a mess to clean up but fire hazard from enemy fire.

Here's a couple M-41 shots, Let me know what you want and I'll be happy to shoot any angle or part you want.
Bill