I'm constantly reading this thread being so jealous of your carry options. Love the ideas guys. Just be sure to practice. It's amazing how muscle memory takes over in a high stress life threatening situation, I've seen it first hand. If your used to drawing from the belt, practice from the truck because if it's not natural or first instinct you will always grab for the belt first.
Stay switched on my friends! Practice practice practice. Even if it's every time you park in the driveway or garage yank it out once or twice. This way it will become natural.
For instance I'm left handed, I can draw and shoot with my right as its a requirement for qualifications at work but... I also wear a cew in a right hand draw, this keeps my confidence up to use my right if in a vehicle so I can shoot cross chest rather than being all kinked up with my left. Lefties I suggest going to the range and spending a day doing this, it will make life much easier if required. If your driving that day it you will appreciate it. Even if you draw left and transition hands to shoot. I highly suggest anyone being able to shoot comfortably with either hand.
This is no lecture, just advice from someone who has had to draw with support hand from the hip while in the driver seat, pinned in the car by another her car at my door (intentionally).