Sufficient power is somewhat subjective. It will get you up any hill you will likely want to go up, but you will be in the right lane with the trucks going slow up the hill. I don't have an issue with this but others might find it unacceptable. There are a number of threads on here about the power of the Ford V10 that might be of interest. You can likely find them here with the search or do a google search as there are other boards that carry on similar discussions. Also, if you visit Gone with the Wynns and look at their Alaska trip videos, they spend some time discussing the Ford V10 on hills and provide good video of them climbing some hills.
I personally don't think the power of the Ford V10 is an issue. I also don't think you can go wrong with a Newmar Canyon Star if you like the coach and it has been well taken care of.
2005 Newmar Kountry Star 3742 - Gas
ACME Eze Tow Dolly
2008 Chevy Malibu Toad