chieftain said:
Each of us must first generate the equivalent of a mission statement. What is the purpose of the weapon, legal ramifications etc...., then choose. There really isn't any right or wrong.
Quite sage advice and really the answer to what a "truck gun" is. I too have lived in most parts of the US (active military) and the definition and mission of a "truck gun" could range anywhere from a .22LR pistol to your seasonal deer hunting rifle or fowl bird gun or even an AR carbine type rifle.
I consider the "truck gun" to mostly be a long-gun, but I could see the need is some situations where it could be just a .22LR pistol/revolver. Theft is a concern, but that really depends on where you live, where you work and what you do.
Defining the mission will determine if you really need one and I don't think a gun dedicated to a vehicle is for everyone. My reasons have been everything from a hopefull opportunity to do some hunting after work to traveling for the job and wanting a little insurance if something bad happened. In central Texas, wild dogs were such a nuisance that shooting them on sight was acceptable practice outside city limits; the same was true of coyotes up in WA near the Canadian border.
I personally never left a long gun in my truck where it wasn't "moderately" secure. Sure it's a risk, but everyone must conduct their own risk analysis to include the legal ramifications as chieftain mentioned before considering a dedicated truck (or any vehicle) gun.
If you're not in an area where pest control is the norm or you're not carrying a hunting firearm for those chance opportunities of hunting time, than your reasons are most likely more towards insurance against an event that might require serious self-defense. I consider that last scenario one of the least likely, but everybody needs to assess their own situation and make their own decisions. I really like the idea of a cheap 12 gauge pump shotgun...even the two-barrel combo's can be found quite cheap. If it's not hunting season, you can always be prepared to shoot skeet or clays; either way, a shotgun can be an effective tool against pests, deer hunting opportunities (legal of course), a couple hours of skeet after work or self defense under the worst possible scenario.
Another consideration is if your vehicle breaks-down. I would hate to leave any firearm in my truck where I knew it wasn't under any type of moderate security. I live out in the country with a long drive way and I work on a secure installation; never any troubles with a firearm stored and out of sight. Even if I broke down a few phone calls and you could get the wife, friend or relative to come meet you (that's my plan if the truck needed to be towed). Again, define your need, assess your situation relevant to your environment and activities and make informed decisions on what's best for you and your interests after taking all aspects into account.
I've had ammunition stored in my vehicle for exteneded periods in extreme heat. I never had an issue, but my rule of thumb is no more than six months and it gets rotated out. Corrosion is also a concern, especially in the high-humidity areas and seasons. I've never had any issues, but I've seen what salt water can do to "boat-guns" that my father-in-law keeps on his fishing boats...a little surface tarnish isn't a mission stopper, but corrosion can jack up your internals if you're not careful.
ROCK6