Well, two things come to my mind here...
One, I always try to take the shot from the same elevation as the Jeep...
Two, don't shoot the shot looking up from the bottom or from the top looking down...When taking a shot, make sure your camera is level. Shooting uphill/downhill removes the incline and makes your shot flat.
Also, try to get some landscape in the shot... Trees almost always grow straight up, and compared to the angle of your Jeep will show the angle of the trail...
2000 XJ Sport (His)
-Rusty's Front tow hooks
1999 TJ Sport (Hers)
-ClassIII tow hitch