Traveler sleeping at rest stop near Malad City awakened by possible wood knocks

The witness had stopped for the night to sleep in a pickup camper at a freeway rest stop. After first hearing brush-breaking sounds and a single loud wood knock around 11 pm, the witness fell back asleep. Around 3 am closer brush-breaking followed by two wood knocks from separate uphill directions prompted the witness to leave and drive to a nearby town.