I use RV Trip Wizard to get the initial routing. It allows me to easily choose locations based on miles or drive time and includes pictures/reviews or campgrounds. I try to stay under 300 miles/day. We are Harvest Hosts and Passport America members. I compare the locations that I selected with RV Trip Wizard to whats available using Harvest Hosts or Passport America. I also use Campendium and Free Roam especially when looking to boondock. Allstays has been around for a long time and is another good choice.