After reading a few pages of that, I think I'm moving more towards a pack to take with me in the car to avoid the need for a truck gun. Maybe a pack that can haul useful things from vehicle to vehicle and could still be carried in certain venues but not look like a dork at wal-mart LOL.
I take long walks (sometimes at night) and always have to grab a pistol, mace, flashlight, phone, etc. and try to haul along with dogs while wearing gym shorts. I think a small fanny pack I can take with me for that and in the car is the best compromise vs carrying a man purse into the store. But that still means either keeping a truck gun, or just carrying one gun (in which case it will still have to be small enough to carry on-person too).
Phlster Enigma is your answer maybe