Just bought 06 TBSS. While looking at it in my garage, it sags on the passenger side. Looks to be all stock and the vehicle has 115000kms. Looks straight too.
Sags on the passenger side about 1 to 1.5 inches. 1.5 in the rear from side to side. Is this common?

 

Congrats on your purchase ! Love those TBSS !

Did the previous owner have a fat girlfriend ? Lol

Take floor to fender lip meadurements and start from there .
Sometimes depending on the surface a vehicle is on it can be an optical illusion ,
Happens to my stuff sometimes too and makes ya think lol.

 

possible air bag bad?

 

rear air bag sensor needs to be either adjusted or is bad.

 

Mine does this as well and is not the airbags, it has something to do with the front suspension. I have replaced it all with Belltech struts and new springs and no fix yet.

 

A friends tbss had a local muffler shop swap muffler and burnt a line alil and cause it to lean to a side. Might be that

 

The stock bags will leak/purge almost instantly after shut-off.

Also they are uneven from factory so when lowered spacers are usually needed for a dead on measurement.

 

The bag delete has been one of my favorite mods to date.

So glad I dont have to hear that damm compressor anymore.

I went with the 3" drop belltech trailblazer springs and it put me at about 31.5 / 31.25 with my new tires .

Rides alittle stiffer but feels like a true sport truck now

 

I had this exact problem. It leaned 2" on the front passenger side. I even adjusted the rear bags and the front was still off. I finally lowered it will the belltech drop struts and I used the spacers to bring it up to match the drivers side. Asked around and apparently it's very common.