I exclusively hunt public. If I see a truck parked I tend to go to a different location out of curtesy and my own safety. This is rare though because I tend to beat the crowd by getting parked and on my way about an hour before first light. I usually avoid weekends too. I do leave a note on my window saying "Hunting SE corner of CRP field along river" or something the like. Hopefully someone would take the hint to stay the F away.