Matt Pruitt, Bigfoot researcher, field coordinator and investigator for the Bigfoot Field Researchers Organization (BFRO) wrote on his blog about an interesting technique he's been using to better observe Bigfoots visiting the campsite. The theory is that rather than us going into the wilderness areas and back country to pursue the sasquatches, it's probably better to wait for them to approach us. According to Pruit, sasquatches looking for opportunistic food sources are known to approach areas of human habitation/occupation:
"Sasquatches will approach camps, lone vehicles, etc. in very specific scenarios; usually in search of food. Many people (witnesses and researchers alike) have heard them moving into camp in the wee hours of the morning to investigate human "stuff". Often, they'll even hear the sasquatch(es) touching/examining tents with human occupants. This occurs frequently, and offers a great opportunity to document sasquatches. However, at the first sign of human movement (unzipping a sleeping bag, unzipping a tent, etc.) the sasquatches typically vacate camp immediately. Dr. Jeff Meldrum experienced this during an expedition in the Siskiyou Wilderness of northern California. Many people have heard sasquatches doing this, but only a few people have seen them in the act. Most tents don't allow you to see much through their walls or mesh windows in total darkness."
Pruitt writes about a few accounts from witnesses where under certain scenarios, sasquatches had approached their vehicles. He also quotes researchers like Matt Moneymaker on how to take advantage of the situation:
BFRO Director Matt Moneymaker wrote about setting up surveillance systems inside vehicles for documenting camp approaches. He states: "The most passive camera traps are ones requiring no installation, testing or camouflaging at the site, such as when cameras are already set up inside vehicles. Rigging up surveillance cameras inside vehicles is a much bigger project than one might assume, and needs to begin long before the expedition. If it succeeds at a given spot then it can succeed repeatedly there. If it does not succeed, it can be relocated to other spots as quickly as the vehicle can be moved."
Dennis Pfohl (Colorado BFRO investigator and Erickson Project member) recorded this example of a sasquatch walking through a small camp during a field excursion in Oklahoma. From this BFRO article: "The night this clip was recorded, a search and rescue professional (Rob B.) attending the expedition said a tall massive figure came up to the vehicle he was sleeping in (a 4x4 pickup). The animal pushed up and down on the tailgate with tremendous force. It then walked around to the door of the pickup. It leaned over the hood of the raised 4x4 from the side, to look down through the front windshield. It then it grabbed the door handle and rocked the vehicle a few times. It pounded lightly on the door a few times before walking away. Rob couldn't move while it was happening. He was laying on the seat, in his sleeping bag, looking up through his slightly fogged windows. He could see the figure's size by its silhouette against the starry sky, when it leaned over the hood of the raised vehicle to look through the windshield."
Veteran researcher (and friend) Tal Branco often used his vehicle as an observation blind. In addition to trying to observe a sasquatch approach his camp from within a vehicle, Tal would mount a parabolic dish on the roof of his vehicle and listen with headphones, anticipating an approach. This method yielded several recordings of approaches and vocalizations for Tal, as well as one sighting.
Kansas-based bigfoot researcher Randy Harrington had an extended observation in southern Oklahoma from the cab of his truck. After devoting time to researching various "hot-spots", Randy decided to set up a small camp in an area where the resident sasquatches had a reputation for taking human food from campsites and trash bins in a heavily used recreation area. He was also monitoring the area with a microphone mounted to the roof of his vehicle. He was able to hear the sasquatches approaching his camp, and therefore was able to anticipate their movements and observe them.
Read more about Pruitt's technique on his blog here.