Nice finds. My search of WW2 Tiger resupply and maintenance turned up very little in the way of stowage. In another forum, I did find a couple of images. The concensus seems to be as Kevin, Sapper and Jakko noted.

Unless in a maintenance and supply scenario, or in transit to the front, just about nothing stowed externally.

Note the barrel strapped to the side, wouldn't have gone into battle with that. And the second photo with fuel cans and tarps.

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...are those cans in a box?