We killed 2 nice bucks this year off the back of my Gator parked smack dab in the middle of a wide open field. Rifle was on top of the cab. My kids thought it was hilarious I was taking them on a 'hiding in plain sight' hunt.
My son killed 5 or 6 does this year from a parked truck in the middle of fields. When it's cold, he sits in the cab. When deer come out, he opens the door, slips out to the ground where he already has his rifle set up to shoot prone on a shooting mat, bipod, and rear bag. All of his does were between 200 and 350 yards, all perfect shots requiring no followups.
Don't be afraid to think outside the box, defy conventional wisdom, and to try stuff you think wouldn't work. You will become a more successful hunter.
All the deer I've hunted simply don't spook from stationary vehicles or atvs as long as they don't smell you or see you move. Sure, they will freeze and stare at it... which is exactly what I want them to do before I shoot.