Pass thru is only convenient if you travel with others, if you travel solo, there is no real advantage.
On the security thing...... if there are guys outside with guns...... pull the covers over yer head and hold yer breath. I cannot imagine how crawling thru, starting the engine and driving could be a wise choice when they have guns. Animals tend to scatter when humans make noise so unless you are stalking that cougar, in the minute from opening a door and getting in the truck I cannot imagine a problem, be noisy, turn on the lights,