Thank you for the detailed information!

 

I put in a 9 inch Atoto head unit and added a camera like the ones pictured above. Mounted the camera up high, great picture and view but no guidance lines or if they are available cannot figure out how to add them.

 

Could you post a picture of where you mounted it on your 2001 express?

 

Here is the picture but my 3500 is a Roadtrek class B.