M35 operates under water

Yeah, but … What about the cargo?

‘Glub, glub’

http://xbradtc.com/

If you’ve been afield for a length of time, you know you can’t take an operational vehicle, slap on a snorkel and extended exhaust and head straight under water. Think about that APC or Bradley you rode around in. Would you trust its bilge pumps after a few days of dust and dirt at Fort Hood or Bliss or Irwin? And the ramp and engine compartment seals … Not bloody likely.
An M35 2-1/2 ton would be the same.

Tell Joe Driver he’s going to take his truck across a river – underwater.

Plus there is the river bed, entrances, current speed …

A looks-good idea, but in the neighborhood of a mid-1950s idea of supplying forward units with a zipline-like setup -- from beachhead to frontline battalion, ammunition and supplies delivered by a motorized box riding beneath a steel cable.