Mines the "work" vehicle. I own a gym and do some in home training for those who can afford me! I write off everything i do to my truck. Including my shrockworks stuff! "It draws attention to the truck, thus people see my window sticker." ha! Shrockworks is advertising for my gym!
My X is my work vehicle. I usually load it up and carry a couple 100 lbs of gear in it per job. I will put the seats down and literally jam as much gear into it as will fit. I also used the hood, roof and rear cargo area with the hatch up as area to put my tripods to film off of. I have had hood mounts on the X and gotten great moving shots.
I write off everything I purchase for my truck, including tires, Shrock stuff, oil changes, and all other mod parts.
I am a director of photography/cinematographer. In simple terms, I am a cameraman. I work on corporate and commercial projects as well as films and music videos. For example, I have a show on HGTV right now called "Look What I Did." I shot all the episodes in PA, NJ and NY. Since I work for a ton of different companies, my work requires a lot of traveling. In turn, I end up putting a lot more miles on the X then the average person would.