I'm another one who uses Microsoft Streets&Trips for planning. I set it to start driving at 9am and finish at 3pm each day. Then I set my home as the start and end point, and the destination as a stop. It will then calculate a route based on my preferences and show any overnight stops along the way. I then start at the first overnight stop and look for campgrounds nearby - after selecting a possible campground I go to the Good Sam website, rvparkreviews.com, and tripadvisor.com to read reviews for that park, along with the park's website, if available.
If I can't find an acceptable stop at that overnight place then I look backwards along the proposed route until I find something acceptable. I prefer to be off the road by 3pm so we've got time to relax each day so I only stretch the days out if absolutely necessary.
As I identify and enter each night's stop on the S&T map I rerun the trip planner to identify the start for the next night's stop. It's an iterative process but that's part of the fun of planning a trip!
I also set our home as both the start AND end of the trip so that I get a complete budget for the trip - S&T provides total mileage and time, and calculates a fuel budget based on your inputs - I use 7 mpg and $5 per gallon to get a rough idea of the fuel budget. You can also have it display fuel stops if you want.
Microsoft has announced that they will no longer be offering support for S&T so the 2013 version is the last we'll see. But it will still work - I used the 2006 version until I upgraded to the 2013 version 2 years ago and the maps haven't changed that much in the intervening years, so I figure the 2013 version will work for me for at least the next 5 years or so.
I prefer to use an off-line planner because our internet connection is through a Verizon Mifi and I'd rather keep my data available to see pictures of our grandkids!
