Your concerns for your home and family are well taken. Yes, lock the doors to your house and any vehicles parked outside. If you can, relocate vehicles kept outside to your back yard - especially if it's fenced. Motion sensing security lights on all sides of the house would be a good measure. They are cheap, readily available, nearly impossible to defeat, but a bit of trouble to install. (Philips Lighting advises that several lighting types are being phased out including selected 'standard' high-pressure sodium (including retrofit), high-pressure mercury, and standard performance metal halide.)
In the event of a home invasion, a 4-ounce canister of OC (pepper spray) on the nightstand beside the bed is an effective (but not deadly) precaution. Due to my LE training, I recommend the gel. It's sticky, not as easy to wipe off as the foam, and you won't walk into your own cloud of OC. Since you live in the Colorado mountains, I presume you own a firearm. Keep it handy.
As to the truck, you can make it quite a bit more difficult to steal or steal from. A big steering wheel lock is visible from outside the vehicle and may deter mayhem. I have an old school one that locks the steering wheel to the brake pedal or the accelerator pedal. One thing I've done while out hiking and having left the truck at the trailhead is to chain the interior door armrests together with a length of chain that is just long enough for you to squeeze your hand into the cracked open door and use a key to unlock the padlock. It's a primitive measure, but it'll give the thief something else to fight with after he's defeated the door lock.
One of the things these guys do is defeat the hood mechanism and steal your battery. They do this by either unplugging the horn electrical connector, cutting the horn wires (either silences the factory security system), and then defeating the mechanical hood latch. With minimal tools and skills I have made this approach impossible. See photos.
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