2013 Peterbilt 348 keeps blowing air bags

This truck has an air leaf suspension with 4 air bags. I haul scrap metal so the loads do get pretty heavy. I have an international 5900i with a similar air suspension that never pops the bags even when it's overweight by a lot.

The Peterbilt bags are really tall and set on this little plastic stand. When they pop, it usually sheers the bolt off.

So my question is is there something that could be causing this other than the weight? Will bad shocks or bad torsion bars cause it to blow the bags? This is a roll-off truck and I do dump the bags when I pickup the loads. They blow while driving at ride height.

If it's just the weight, is there anything that can be done to beef it up? How much work to change to a solid suspension?

 

Yes. That load ended up just being wayyy to heavy.

 

It's hard with scrap metal because we are not loading the box. It's on site at the customer's location with no scale.

 

I'm not a suspension expert. Can you tell me what to look for? Or send a picture

 

It does have those. Two of them. I was told to check the bushings in those arms.