Swedish test video of 1951 comparing Swedish light tank, Panther, Sherman and Churchill. The video is pretty much a Sherman bash and Panther praise. This may explain why they never bothered to buy surplus Shermans and introduced Centurion tanks later.
(hat tip to Nigel Wells)
related: 2010-08 Mean maximum pressure paper
This short excerpt from a wartime propaganda movie shows the same traction problem with the M3 Lee/Grant (same suspension and tracks as many Sherman tanks).
Please note that many "modern" tracked AFVs and almost all wheeled AFVs have their hull extending forward of the front wheel, which causes additional problems during trench crossing or obstacle climbing attempts (example). Dozer blades don't help in such situations either.
German test with Leopard in woodland:
(mostly wet soils, trees with flat instead of deep root network)
Upgraded AMX-13 climbing 45°:
A rather brazen way to cross a trench:
These buggers were specified to be slim enough to pass between trees:
In the end, remember it's often first and foremost about the driver:
Antiker BW-Lehrfilm über Geländefahren mit LKW etc.