I also inspect homes for a living. Some days I have 200+ homes to inspect in my queue. What I do is use first Microsoft Streets and Trips to import an Excel spreadsheet of my inspections. In Streets and Trips I can export the optimized route to a GPX file. I then use a great little program called TYRE (Trace Your Route Anywhere) to make all waypoints a point I want to visit. My TomTom Go 720 can only handle 40-45 waypoints, which is a bummer, but the TYRE program can split larger routes into an A, B, C, D etc, so I can take a huge number of waypoints and split them up to I attack my route efficiently.
The website for TYRE is
http://www.janboersma.nl/gett/index.php. A strange URL, but a great little program that makes a world of difference. I then load GPX files onto my TomTom as TomTom files so I can use them in my daily work. It has been a great help, and I work with these products everyday.
Michael