This is only tangentially related to RV's, but I thought that some might be interested in this new product from Garmin. It's a GPS based computer for the bicycle that keeps track of EVERYTHING. I recently installed one and am amazed at all it does. I've always had a computer on my bike, but this thing makes the others look pretty crappy. The best thing is when you get home you can download the whole ride onto a pc with the included software. You get nice graphs showing elevations, grades, cadence, heart rate, etc. I realize this isn't everybody's thing, but you gotta love Garmin.
http://www.garmin.com/products/edge305/
http://www.garmin.com/products/edge305/
