Thanks for the replies, folks.
The laws here are a little funky but not bad these days. It's legal to have a loaded pistol in your car for "all legal purposes, including self-defense" but there was some confusion among the LEOs I asked if directly under your seat is "in the vehicle" or "on your person". With my permit, now, it's a moot point - legal all around.
Still, I'm not to keen on the idea of drawing and reholstering every time I get in or out of the truck. Solution: another new "vehicle-dedicated" gun!
I just traded emails with Tony from M-S. He's not sure, either, if they make the Watch Six for the MK-9 but gave me the number at the factory to find out. At $58 and with nobody crying "POS!", it seems like the smart way to go for now.
Btw, I'm not overweight. Too damned skinny, actually, or I'd have stuck with my Glock 21 for a carry piece. It'll still work in the winter but I end up looking a bit like John Merrick Jr. trying to conceal it in just t-shirt and shorts.
Whereabouts is Lightning Arms, Smokey? I'm up by Longmont/Loveland, north of Boulder (,People's Republik of).
Thanks again, all.