campguy, first let me say welcome to our website and forum. Although I do not own an Airstream, the dealership that I work at do sell them and I can think of several of our customer that are using the Suburbans to pull their 25' Airstreams and a few are towing even larger trailers. The Airstream; because of its areodynamic shape does tow well as I am told. Good luck in your research and decision.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7