My wife and I tested out the Baofeng last year on the way back from CO. In western KS with the long rolling hills out on the highway we could transmit and receive to about 5 miles. After that the 5 watts just wasn't getting out. On trail in CO and UT transmit and receive are cut to less than half of that if not more. So I feel comfortable that I'm not walking on anyone. However, that said, if I were going when I knew there was a big event or there would be a lot of other rigs on the trail in different groups, I would be concerned with bleeding over onto other bands. My preference is definitely my mobile unit.