Troy, The adhesive comes in two types: "temporary" and "permanent". I have no idea what's the difference and how much more sticky the permanent one is. I've used the "temporary" one and it holds just fine. I imagine that when I pull it up, I'll just scrape off as much as I can and use some lacquer thinner or something to take up the rest. It doesn't appear as though it's trashing the dash. At $10, it's a cheap and easy experiment, I think. Once in a while, the easy way to go actually DOES work.
What are the details on the BRLRC trip. Is that the Geocaching trip listed on their website?