If the water is still or slow moving I have had a blazer in the water up the bottom of the steering column. If it moving fairly good you will have to decide whether it is safe or not on site. You don’t have to worry about DC systems shorting out when it gets wet like you do for an AC system. It does help if your fuse box is water proofed and that can be done fairly easy and you can find a lot of sights online about the subject. You can have a snorkel system installed and then to can play submarine if you want.