I'm rollin' on dubs (kidding, just had to say that

) and I tow/haul regularly w/out problems. Based on everything I've heard about the sway bar, I'm sold, just need to order it up.
The stock tires on my factory 20" wheel upgrade are
Dunlop SP Sport 5000m:
P275/55R20
also on the sidewall - IIIH and M+S
Max load/pressure: 2403/44 psi
I'm not that educated about tires, but I hope this helps. Link with good info
here.
Oh, it also said
plies: sidewall - 2 polyester
tread area - 2 polyester + 2 steel + 1 nylon