Your original post got me to thinking about my own situation because I was leaving shortly on a trip from Kingman, AZ to San Antonio, TX and I knew there would probably be occasions when I would have to leave my weapon in the car. In the past when I have done so I always remove the magazine and store the empty gun in my locked glove box.
After doing some research I bought a Hornady TriPoint Lockbox. I have a hidden compartment in my vehicle and the lockbox fit perfectly, thereby giving me a safe place to store my weapon. We just returned this past Monday from our trip and I will continue to use the lockbox if the need arises again. I only used it twice on our trip, but it worked out well because I also used it to store a substantial amount of cash along with my gun.
Love the box, well worth the money.
Hornady Manufacturing Company :: Security Products :: Lock Boxes :: TriPointŪ Lock Box