My dilemma is pretty simple: I have a Subaru Outback, plus two kids. We often like to go on "Multisport" weekend trips where we bike, hike, and sometimes do other non-riding activities. But without a fairly good way to lock bikes to the car, we can't really do anything that requires leaving the bikes (especially at some remote trailhead).
So for anyone who doesn't exclusively do MTB weekends, and who doesn't have a vehicle large enough to put several bikes inside, what do you do for security?
How many times a year do you travel with a full car and bikes? Is getting a bigger vehicle out of the question? I have 2 kids as well, both in car seats, as you know having small kids means bringing all sorts of things you don't need with older kids.
We picked up a Suburban a few months before the second child was born and I love it. I normally have the bikes on a hitch mounted rack on the back, but if we need to go somewhere and leave the car out of sights I can pop-up the third row and quickly stuff the bikes in there without having to remove the wheels.
We also have a trailer now for camping and while I can attach my rack to a hitch receiver on the rear bumper of the trailer, it is just as easy to put them inside the trailer where they are not visible at all.
I do not believe there is any such thing as bombproof, a determined thief will get something if they really want it.
to your own admission, the theft of your bike was due more to being left visible overnight more than anything else.