While I totally understand the "I don't want to drill or cut holes in my truck" sentiment - as someone who has both a snorkel and a back bay customs tailgate storage lid I will say that both have been extremely useful. When you have a wife, a kid, and a 70lb dog to take camping every little bit of space is welcomed. And the thing about the 80's intake being high - that is true. But if you plan on fording water very deep at all just keep your head on a swivel because I've put my 80 in water over the hood in places I thought it wouldn't reach my door handles...personally I was very happy to have the snorkel in that moment.
This is why you always test water before driving in.