I would suggest just creating one "base file" and using that across your scanners. This way you just have to update that file and upload across the different scanners.
The other thing that I might suggest to go along with this would be to generate "trip files"...say for instance you're going to go to Phoenix, load a system with all the data you need for the trip and save it as Phoenix. Upload before your trip and you can delete afterwards from the scanner. It will still be saved on your computer and for the next trip, just load it in.
So, if you had a blank, new scanner, you'd load "base" (what Assaf was suggesting) and then for your trip, you'd also load "Phoenix" and be ready.
Delete it when you get back and generate a file for your trip to Denver etc.
Get the idea?
Tom