I carry my XDm in a holster under my steering wheel in my Jeep when I go up in the mountains. In the summer when the doors and top are off its pretty visible from the side. I dont have it sliding around on my dashboard and I think anyone that gets positioned into a search by having one exposed is one of 2 people... Someone doing something wrong... or second being someone who need to sue the department for illegal search and profiling. Dont sue for money... sue for principal. Its a slippery slope and once the departments start sliding down that hill... we lose a lot of our freedoms.
I also store a laminated copy of the Colorado law statute stating it is completely legal to carry a loaded and chambered handgun in the vehicle. Should I get pulled over for some reason, I give full disclosure to the LEO about the weapon, its state and my vehicle is turned off, keys on the dash and hands on the outside fully visible. There is no reason the folks who do put their lives on the lines should need to feel nervous if I can help it in any way.