I wasn't going to post these pictures, but since it might give others ideas, I doubt the risk is too great. I built a permanently installed carpeted cover over the back cargo area so I could keep my trauma kit and 2 totes full of trail gear out of sight, and added a hidden gun compartment behind the back seat. These pictures aren't great, as this was right after the build and I had not yet vacuumed the carpet to get all the sawdust off.
With the seat folded down:
With the door opened:
Mossberg 500 with stock that folds over the top on bottom, with an AR on the top. This compartment also holds 500 rounds of 223 (including four 30 round magazines that are ready to go), 300 rounds of 45 ACP and several boxes of double OO and slugs for the Mossberg. Still need to install the electric latches on each side to add security, but no one every knows this is a compartment, even when the look under the deck in the cargo area. The door is a tight fit, and I stuff a tool bag on each side on top of the fenders that must be removed to open the door, so not real concerned about it being discovered by someone wanting a 5 figure discount.
The STI 1911 that's always on my hip is just to get me to this compartment if things get really ugly, but it's unlikely this will ever happen. These are just tools for particular situations, just like the welding system on one of the totes in the back. I hope I never need any of it...