I HAVE 1990 E/B WHEN I PARK ON UNEVEN GROUND MY TIRES PITCH IN AT THE TOP IT LOOKS LIKE I HAVE BAD BALL JOINTS. I CHECKED THE BALLJOINTS THIERS NO PLAY. THE FRONT END IS THIGHT TOO.ISTHE TILT IN NORMAL
Could possibly be the pivot bushings near the center diff. You may wanna check those out, or the Radius arm bushings. Possible the tie rod ends might be worn out too?