I hope you get good use out of the Galaxy. There will be a new/better/shinier phone available as soon you have figured it all out.
My favorite iPhone APPS for RV travel:
1. YELP - for food suggestions
2. iEXIT - for what's up at the next exit.
3. GAS Buddy - of course
4. MAG Light - For reading menus/manuals - flashlight and magnification
5. Waze - for crowd based traffic reporting.
6. Roadtrippers - for route planning (web site) and activity planning (iPhone)
7. MyPilot - Flying J/Pilot location finder
8. I am trying the Garmin RV 760LMT and iPhone app Smart Link