What's with those logs on tanks?

Old VFW tank gets a facelift

Electronic log mandate is finally on the books

What's with those logs on tanks?

5 types of extra armor that were added to tanks during WWII

5 types of extra armor that were added to tanks during WWII

Guess What The Water Tanks On New York Rooftops Are Made Of

Armorama :: Logs on Shermans

32 Stock Tank Pool Designs and Ideas

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Gas Powered Fahrschulwanne Tanks - Tank Encyclopedia

Why Do Some Tanks Carry Logs? : r/MilitaryHistory