We've done this drive quite a few times. There are two ways to go :
1) Around the east side of Glacier and through Babb and up the east side of the Rockies in Canada.
2) Through Whitefish and up the west side of the Rockies through Fairmont BC. Take Hwy 93 at Radium instead of going all the way to Golden and taking Hwy 1.
I'd do #2 as it is a bit shorter and much more scenic. Other posters have given you some good tips for camping on that route but the two I'd pick for a bit of a splurge are:
1) Riverside Campground in Kimberley, BC. Just outside of the town of Kimberley where you will find some fantastic German Restaurants.
2) Fairmont Hot Springs RV Resort. The hot springs pools are right next door to the RV Resort. The restaurant at the Riverside golf course is ok. There are also restaurants in the Lodge by the hot springs. You can easily walk to both the hot springs and the Lodge from the RV park.
A good place to stop for a bite en-route is Café Jax on the main street in Eureka, just south of the US/Canada border. It was on Diners, Drive Ins and Dives and is really good.
