Looks a lot like the route my family and I took last spring. I live in the Ketchum area and am very familiar with most of that route. It's an amazing drive. We have a 1993 Thor Ambassador 33' and it was no problem. We weren't towing anything so that might slow you down a bit but all of the roads should be do able. You have however choosen one of the most whindy streatches of road known to man. Most of the section from Stanely to Missoula follows a river - right next to the river - as long as you are prepared it's no big deal, great views just keep you eye on the road.
Ketchum is great. Good shopping lots to do. It's a ski resort town so definetly check it out.
Stanely is beautiful, definetly try to plan a day or two there. Go to Redfish lake and hang out for the day, eat dinner at the lodge, you wont soon forget the view. Mountain Mamas is July 21-22 this year. Kind of a folk art festival. Lots of people but fun to check out if you are in the area. Camp grounds are extremely full all summer in this area, so try to reserve something. Might be able to find a hookup in stanely, if not sunny gulch C.G. is close and first come first serve, you might be able to find something there last minute. Last ditch effort might be to contact one of the local hotels, they might let you park overnight for a small fee. Truely a great town with lots to see.
From Stanely to Missoula is beautiful but not a lot to stop and see. The only side trip might be off the top of lost trail pass towards Wisdom MT. There is a Native American museum that is pretty cool. It was the sight of the battle of little big hole. A pretty pivital battle in the American frontier history. Museum was under a remodel when we were there but you can do lots of walks onto the battle ground and surrounding areas, truely unbelievable.
Hwy 200 is one of the most beautiful drives you can find, however you will probably find it boring after being in Glacier . Lots of places to stop for the night. When you get to Lake Pend Oreille there is a resturant in East Hope called the Floater. One of the only floating resturants in the area.
Just ran out of time I'll write more in a bit.
Seth