Another truck and camper match question...

Let's start with...I am a professional worrier, so reading about others' experiences doesn't really help to reassure me with my own concerns. And,unfortunately, all the literature on matching trucks and campers is just plain confusing.

You just answered your question. As others have stated, go bigger. Get the one ton. You will not regret it for hauling a cabover camper.
If interested in a Ram, now they are available with a 6.4L Hemi gas engine that is less expensive than the diesel and weighs about 500 pounds less. In a one ton dually you should have more than enough power, payload and camper capacity.