This has really only happened when I'm offroading - but I'm curious to know if anyone else has experienced this and/or knows why it happens. I paraglide and that often involves hitting rocky roads in either 4H or 4L. I *do* know how to shift into 4L properly - that isn't the issue. Once in 4H or 4L and parked, I'll often get these seemingly random single beeps that don't correlate to anything on the dashboard or other displays. The beep happens once...then again in maybe 15-40 seconds, and continues on from there. The reason I share that I'm a paraglider in this story - is that we're often at high altitude (some of our launch points are at around 12,700 feet) and I'm often parked above tree line on shifty roads comprised of rocks that can shift under the tires. There's also a decent amount of wind sometimes, so the truck would be rocking around a bit while in park.

Does the Tundra have some sort of sensor that beeps when a parked vehicle is shifting either in the wind or on an unstable surface, but doesn't show anything on the display?