Im wildly sorry that I resurrected an old topic from the dead, just have a few interesting observations from personal experience, maybe someone will need this information in the future.
I installed a $49 "Wally-World Special"
https://secretstorages.com/best-car-gun-safe/ for my weapon security in my truck.....it's heavy steel, a very-heavy locking bolt, and bolted AND WELDED to the transmission hump, no smash-and-grabber is gonna get it, without a LOT of time and a torch....Made In China, but steel is steel.....I mounted mine under my console, but the OP could do the same type of heavy-duty mounting under his bench seats.
Any REAL, steel safe is better than the cheap, cable-lock stuff, and with proper mounting, they are your best and CHEAPEST bet, to KEEP your handguns and ammo secure, until your return....Like Isreal Putnam has said in his state, here in Kentucky the "No Firearms" signs don't have force of law, either, so it's a rare occasion when I stow my carry piece in there, maybe a trip to the Sherriff's office to pay property taxes once a year, etc.....I use my safe more as a secure backup for extra ammo and weapons, so I'll ALWAYS have a weapon with me, if I forget to strap-on my carry piece that day when I leave the house (it DOES happen from time to time, getting old is a Bee-Otch)....