I've never seen one that far off before. I would get under it with a measuring tape and do some diagnosis. Check the perches to see if some previous owner installed the rear-end off center. Check the panhard bar for straightness. Check the trailing arms for damage and/or rust, etc,
Good luck, Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!