My EDC is a Ruger SP101, .357 mag.
Behind the seat in my Ranger pickup is an old beater Mossberg 12 ga. Cruiser, short brrl., loaded with 00 & #4 buck. I take 'er out & wipe 'er down with a silicone cloth, every once in a while.
I Winter I don't leave it in the truck, because it picks up moisture & rust too easily.