I do like the Good Sam Trip Planner. A big advantage over Google Maps is the included database of Good Sam and other RV parks, and Pilot/Flying J truck stops. (I used to use Streets and Trips with the added database for this stuff - no more). It also lets you do more the 10 stops in one itinerary vs Google Maps.
Their relationship with Pilot/Flying J excludes Loves's, TA, Petro etc and in many areas there are few if any Pilot/Flying J's. So you have to look elsewhere for those.
If you use Chrome, you will not get good printouts, so use Firefox or other.