Apologize in advance for the one big paragraph - Windows 8 does not allow me to put in paragraph breaks ------------------------------------------------------------Didn't read all three pages of posts, but did read the TM. With 42" tires you can ford 84" which means to the bottom of the windshield. I think this mainly has to do with operator safety, as you don't want to be swimming the truck along and drop into a hole and drown the driver. Obviously, the truck would be fine until the air intake is taking in water. The TM also states that after fording, you must perform all kinds of fun maintenance on the drivetrain. So it really means that if you take your truck swimming, expect to spend some time getting rid of the water that got into stuff. If you don't think that happens, ask Sewerzuk, who's deuce wheel bearings gave out in Portland unexpectedly. He had been swimming his bobber deuce many times in the flood waters of Tillamook and then found out the hard way on the way home from a trip to Eastern Oregon what that did to his wheel bearings. It took a couple of years for them to get enough water in them to seize up, but when it did, it was a real mess. All that said, we ford a big creek every day we are working on that side with bob tail trucks, and our m925. We don't go through more than 18" of water for the most part, and have not found any water in the wheel bearings or differentials. Your results may vary.