I have the factory Nav unit in my 05 SUT. It is nice but having the CD all the time kinda sucks. I wanted to add a backup camera to the factory video screen and there is no way to trigger the backup camera to only come on in reverse. Also not sure if this is of interest to you but with new units like the pioneer you can get XM traffic updates to show on your GPS and then you can reroute around traffic issues. I made this change and now am much happier. I also have rear seat DVD that i was able to tie inot the new unit. The best part is the a full new reciver only cost about the same as the factory unit.
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05 victory edition SUT
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