I sympathize with you, Ace - it's really frusterating. You can't get a straight answer from the car dealer, because they want you to buy the truck, and you can't get a straight answer from an RV dealer, because they want you to buy an RV. I found the best answers and most to the point came from a mechanic - especially one with no affiliations. If you're in Calgary, there's a little shop on Edmonton Trail called Hobo Camper Country. Doesn't look like much, but they really know there stuff there and they have nothing on the line so you should get a staright answer.
When a vehicle rating and specs gives you towing capacity, it's often talking about the most ideal conditions, which you'll rarely be driving in. Even with a tow package, a 3:42 rear end will cause you grief - even a 3:73 would be iffy for any of those RV's you listed. Problem is, you won't notice until you get to a hill. Engine power and transmission won't be a problem for you here I don't think, but the rear ratio and sway could make for some white knuckles you don't want.
I would try the guys at Hobo and see whay they think - it could be that you're fine and we're all over-thinking it for you.
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