For me personally I often take two rifles and both have big cheek rests where you have to remove it all to put the bolt in or out, and it's a pain in the ass.
(And I'm a bit lazy)
I only ever go to where I'm using them. If I stop it will be gas station only. I don't detour or do anything else on the way there or back. I lock my car at the gas station, even though I can see it, Feels wierd but safer.
It's usually only these rifles, others without big cheek pieces I do remove the bolt.
As far as being practical... Like was said, it's no different to having a semi or pump action lever etc. Even if you do remove the bolt it will be in the car somewhere and a bad guy with half a brain will know this. You could take the bolt with you, but then leaving the car un-attended would be where you went wrong.
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