A recent post in which trespassers apparently saw the poster retrieving his handgun from his car reminded me of one of my habits: I keep a towel in each car. Generally, the towels are old and worn out, and preferably very bland in color/pattern. Something the wife won't miss. My old GI-issue brown towels are about perfect.
One of the many applications is to obscure what I am doing. If I need to move something from the car that might upset onlookers, or something I'd just rather they not notice, I just drape the towel over, wad up the extra for camouflage if necessary, and go about my business. For example, sometimes one needs to disarm before entering a 30.06-posted area, or re-arm afterwards. In a busy parking lot, there are many eyes. A towel can obscure the lines of sight, allowing a degree of privacy.
Oh, and I can also use the towels to mop dew off the windows, clean up soda spills, kill reflections, make a neck pillow for passengers, etc. It's a multitasker!
As a transport technique, this is a variation of my grandfather's technique: When travelling (way before Texas had CHL), he carried a revolver in an old, greasy, wrinkled paper bag under the seat. It stayed put, fit right into the decor of his old car, and wouldn't likely grab a thief's attention.
The sooner I get behind, the more time I have to catch up.