zero!! I am suprised it took this long for someone to say it. you are exactly right, if you are looking for something fun to drive, and looks great, and has amazing offroad abilities, then the h2 is the auto for you. but if you need something that is functional, with respect to towing only, then the h2 is WRONG for you. i would be looking at a F250/350 with powerstroke. when you look at all the ways h2's outperform other SUV's, it is a suprise that the towing capacity is actually lacking. this is really a function of the sheer weight of the h2, in this respect the engine is underpowered for the vehicle. put that same engine in a silverado 2500 series, and you will be able to pull a house.
your only option outside of a good truck, is a supercharger...teehee
unaslob
Corsa Sport exhaust(offroad 'tip'), Gobi rack w/ lights & w/roof mounted tire w/ ladder, Warn Winch with rear power, Dual Wolo Airhorns w/ lanyard valve, Hadley Aircompressor 130PSI, 14" airtank, front and rear quick disconnects for air, Cobra 75 WX CB, Dual 4' Firestik fiberglass whips, front tinted windows, 7" Homer Simpson decal (teehee)!