I use a solid state memory laptop for a do-it-all tool, as I like to keep things simple. I'd recommend the smallest screen - but high quality - laptop you can afford.
Since with a small laptop I have a real computer, I can do such things with it as:
- Boot up super fast in seconds because of it's solid state memory
- Store right on it, and instantly view, years and years of family and travel photos
- Fully process photos if needed with powerfull software such as Photoshop which resides right in the laptop's memory at all times
- Watch movies that I stream from the Internet or play from a compact DVD player that plugs right into a USB connector on the side of the laptop
- Surf the Internet via WiFi or surf the Internet through tethering through our smartphone when traveling
- Research RV routes and destinations with Internet access via Google Earth
- Research RV routes and destinations without Internet access via Microsoft's outstanding, free, and constantly updated built-in map application that shows almost as much detail as Google Earth
- Printout out anything on the screen via a small printer that plugs right into a USB connector on the computer
- Read books that can be streamed from the Internet or downloaded and read with no Internet access whenever I want
- Play music via streaming from the Internet or with no Internet access play music from whole CDs that I store right in the computer's memory
- It's battery lasts 3-5 hours and can be recharged from an RV's inverter or an RV's 12V wall receptacle
I wouldn't recommend anything but a full-on, but small screen, laptop for maximum flexibility and simplicity in a small package when traveling.