what is the deepest amount of water you have driven through in a truck and got away with? how deeper water (e.g.up to top step on merc axor) could you in theory drive through without engine stalling if you revved ■■■■ off it? are you just best hitting at speed creating a bow wave? ever risked it and your truck kinda er…died as water entered the cab? 
dont mean the lads with stacks just a normal exhaust pipe under the truck.
greg,
The exhaust isn’t the one to worry about too much, the bigger worry is the air intake. Those are usually quite high on most trucks (I assume). Wet electronics would probably be what stalls a truck in the water I imagine.
I’m rather savvy with dunking Land Rovers in the drink, not so sure about trucks though. Creating a bow wave will reduce the depth of the water under the engine, so in most cases a small bow wave will help.
I used to drive for a bloke in Wressle near Selby and we regularly used the road from Breighton which flooded every year. I never worried about 2/3 foot floods in a Leyland Terrier but we did have one that came a cropper.
Harry had just collected a brand new Leyland Reiver from the dealer and his first job was to come back to the yard to pick up a skip. This morning the River Derwent had come over again and the flood waters were rising.
Harry attempted to drive through but the waters kept rising, we had all done this before, but this one failed, it hydrauliced the engine when the water got to about 4 feet. It was a painful call for the boss asking for a recovery truck and a new engine on the day his pride and joy had arrived 
Many years ago i used to drive one of these:
Although they didnt drive through water, but swam using water jet propulsion units driven off the main engine.
How do I embed the youtube video, not just show the link?
Hombre:
Many years ago i used to drive one of these:Although they didnt drive through water, but swam using water jet propulsion units driven off the main engine.
Put it between the video tags 
billybigrig:
http://www.youtube.com/watch?v=4Sq0O7zDsYQ
Was just going to go looking for that vid.
I used to drive Land Rovers off road so feel wading is a strong point of mine. The main thing to watch is your air intake, most engines these days are pretty well waterproofed otherwise. Exhaust isn’t an issue if you keep the revs up as the pressure will keep it clear. (EDIT: I will add, that doesn’t mean those with a stack intake could in theory submerge the truck!)
Highest I’ve had isn’t in a truck, but during the bad ■■■■■■■■ floods I had a Transit Luton up to the headlights and got it out the other side, only problem was a juddering clutch for the next 5 miles and a missing front number plate!
Try this one
Best way to do it is like this