How do you track your mileage on your 5th wheel/trailer?

I keep a log with date, where we stayed, number of trailer miles from start to end point. (My Ford tracks the mileage when attached to 5vr) Also notes about the facility; hook ups, etc. I also keep any service notes and reminders at the back of the book. I transferred all the service suggestions from the manuals that came with our Big Horn.