I've been obsessing over a secure method of carrying handguns in my SUV for the past couple of months.
In California, we can't lock the handgun in the glove or "utility" compartment, whatever that means. I've done a lot of research and found out that a "utility" compartment could be a center console, spare tire well, jack compartment, or anything else that has a lid or is covered with a top, that is fixed to the vehicle.
But you CAN get a safe and chain it to the vehicle. There's a few companies that sell small pistol safes with a thin steel cable to loop around seat rails and stuff. This is ok for most people I guess but I don't like thin steel cables because they can be cut with even a pair of electrical crimpers. If these seem right for you GunVault offers their units with security cables
http://www.gunvault.com/cables.nxg. There's not law for a DOJ approval stamp for vehicle carry as long as it's locked.
So I decided that I wanted to use a sturdy bicycle chain or even a U-lock. I went to the hardware store and bought a couple of 1/2" eye bolts, washers, and lock nuts. Then I found a metal panel behind some plastic lid in the rear side of my SUV. I drilled a hole and bolted the eye bolt into it.
I bought a plastic, fire and water resistant Sentry Safe at Walmart and drilled a holt in it and bolted the eye bolt into it. Then I locked the safe into my vehicle with a U-lock.
I used it like that for a couple of months but realized that the lock is really easy to pick or even forcefully twist with a flat head screwdriver. Plus it wasn't very pry resistant. I think if I had a large flat head screw driver, I could easily pry open the lid without much effort.
So I went on the hunt for a steel safe that would fit behind my 3rd row seat and the hatch lid. I wanted a steel safe because they're harder to get into. But also, I wanted a digital lock so that I could quickly get in and out without rousing suspicion from onlookers. And I needed the locking bolt assembly to be pretty sturdy to resist prying attempts.
After searching and searching, I found a safe for $50 at Harbor Freight and Tool.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=45891 It's not the prettiest of the highest quality but it was exactly what I was looking for.
It came with a cylindrical key that's obviously harder to pick. I've even tried the "BIC" method and it didn't open up. But the best part is that the key hole is hidden so it's probably not going to get attacked right away.
This little safe is made of 9 gauge steel so it's very solid. The welds are pretty amateurish but it's fine for what it is. I even took the lid off the lock assembly to have a look inside. It's made pretty well and looks to be reliably designed. There's thick steel to hold the door from caving in and the hinged side of the door is inside the safe so it can't be pried out.
I can fit 3-4 pistols all with their own individual soft case.