I have an 08' Tundra that I am looking at adding a DVD head unit along with iPhone connection, backup camera and 2 dual DVD headrests. The questions I have is whether or not to get a GPS head unit. Here's why: The main reason for the truck is to pull my 35ft camper. I am considering buying a mounted GPS that has the options of truck routes so I have access to bridge heights and better routes for towing. I'm not sure if any of the head uits with Nav have this option. So I am looking for thoughts/opinions. Thank you