As long as the air intake stays above the water your pretty good, ya maybe lose an alternator or a sensor, but who cares? Nothing $200 and an hour won't fix, have fun!

Sometimes when fording something deep I get a sensor wet and it seems to stay in 3rd gear, all I have to do is turn it off then back on and it works just fine again.

Just keep up with maintenance: fluids in differentials, tranny, and wheel bearing grease and you should be fine, you don't need to change the fluids everytime or anything just keep up with a higher maintenance, and if you think the water got in something then change out the fluid ASAP.

Check my gallery for "swimming" and I wouldn't advise to go that deep but that is about how deep you can go. 10" is a little puddle, c'mon you own a Vehicross, I would say 20-24" would be a good safe depth. Remember to go slow when crossing water or you will build wake in front of you and that 24" can turn into 36" real quick.