sailorand, this is exactly the kind of info I'm looking for. It tells me that I will likely be 4-500 lbs over with a Chevy 2500 D/A, EC, 4x2 and a Bighorn 3055.
I see that lots of people are towing ok with similar rigs, so with a Prodigy, airbags, etc this might work... so I may decide to go...