Ok, Thanks to all of you for responding and so quickly. I had already convinced myself that I could do this with a half ton and I guess was hoping I would get confirmation of that and reassurance that I was on the right track.
So, you have convinced me; and more importantly, my wife. It is hard to argue with unanimous. 3/4 Ton it is. 1/2 Ton off the table. I like all the comments; braking, tongue weight, payload, tires, future needs, etc..... All make sense...
You probably saved our RV, Truck, My limbs, Wife's limbs and most importantly her cats.
White knuckles is not what I am looking for. DW has already informed me that (her) rv can't travel in the "fast lane"
Thanks again, so much....