Lextreme,
I understand your question.
If you just want to keep the curious away and the low-end thieves (they are all low-end, but I'm talking about the really unsophisticated ones), just remove the (negative) dog-bone (battery cable) using a 1/2" wrench. It's a simple task. Lock one door from the inside by pushing up on the interior handle. Put a long-shackle padlock (Master brand, several locking points, 5 3/4" shackle, I believe), between the grab handle on the outside of the cab, and the exterior door latch on the door that you exit, (the non-lockable door).
Yes, they can break the glass, remove the grab handle, cut the lock, steal the radiator, etc...
This is just a simple way to keep the neighborhood mommies and daddies from letting their kids get in and play Army while the parents take videos with their cell phones to post on Facebook and YouTube and reach "viral" status. It also keeps the dads from trying to start the thing, all the while saying, "I used to drive one of these back in ____!"
I had my truck at an RV and boat storage facility with cameras and gates. It was nice and private, but a short drive. I recently found a local farmer with a nice barn that lets me store my truck for cheap. I can see it from my house and visit anytime. It works for me.
Good luck.