2002 Tahoe Z71 268K miles - Torsion bars

[TexasTahoez71]

I have a 2002 Z71 Tahoe with 268K miles that I have had since new. The only thing I have done to modify the suspension is add rear air bags. I used to tow around a Jeep with a 2300lb car hauler. It has been about a year since I have towed anything that heavy. Rebuilt the entire front end at 215K including Bilstein shocks.

My Tahoe just began leaning on the left in the front about 3/4 inch.

How do you know if your torsion bar or bars are bad? Do they even go bad?
Does the torsion bar mount go bad?
Could it be the shock on the right?
Body mount?

Can't really find anything out there on the web.

Thanks!