I have a 1999, 4x4 Burb (3.73 rear), 5.7 engine, rear airbags 130K miles

What is the best chip for towing?
I know this has come up many times but
I want the latest info and recommendations.

This burb will be towing a camper at the limit of its
specs. I hope to add some torque to make it a little easieron the burb.

(Please dont ask me to buy a differant vehicle, that is not an option)


Thanks Paul.