Due to the size of the Roadhawk and seating postion, I feel I have to rely on mirrors a little too much, and turning around to look doesn't always cut it.
I bought a 3.5" screen, wireless backup camera system on Ebay for about $50or so delivered.
It was super easy to install, and the picture is fabuous. Plus it will give me a very detailed picture of what is behind me and where anyone is when I change lanes.
It was well worth the money.
2bb