Well,
Speaking from experience....
I USED TO work for National, a car rental company.
And we were allowed to take vehicles for our breaks in the evening.
So I look a Ford F250 Super Duty, figured I could pick up some mcdonalds, and head out to the river to do some mudding (bagging)
After getting a good layer of mud all over the truck I went to go and leave, and I was having some trouble with a bunch of ruts (that I had created)
So I went around through the water..............bad idea
When the front tires hit a deep spot in the river I panicked and hit the gas to power out of it, another bad idea as the water only got deeper.
When water started coming through the doors I knew I was in trouble so I climbed out the window and stood on the roof to call some buddies for help.
Truck was doing fine still running like a deer from some drunk hicks chasing it in a field lit by the headlights.
It was fine for about 2 hours till the river rose and water entered through the air filter and killed it.
called my boss, company had the truck towed, Truck was a write off and I got fired..
The only thing Ive learned so far is stock fords dont float.