How big of a swimming  suit does this c - truck need too go swimming . Sounds dangerous for the wheel bearingns also . Better check the depth  or yu might have too call the coast guard for a tow ..

The battery is sealed ,but just in case there is a small leak, a pressurized battery pack would not allow water ingress. As it has an on board compressor it could maintain that positive pressure for as long as necessary, if there was a small leek.

I don't understand the idea of pressurising the battery as a way to prevent water ingress. The way I understand it, for it to hold enough water to pressurise the battery, it would need to be sealed from the get-go, no?