Late-model 1/2 Ton and 30+ feet - Real world experiences...

I pull with an older truck (so there goes one of the three requirements), but do pull a 32 footer. Loaded I'm at less than 6,000 (so there goes that). But yes, 1/2 trucks can do a great job especially some of the newer ones with higher numbers when it comes to towing capacity. But, as you probably already know, getting to the limit of a truck's capabilities can spell trouble.
In terms of power, since you mentioned it, our truck performs as expected, even on grades we've experienced in the Carolinas.