I should have mentioned this earlier, but if you have the time, there are some interesting backroads north of Whistler.
- the paved route from Pemberton to Lillooet is by way of Duffey Lake. It has some good hills that challenge the RVs, but are a piece of cake for cars.
- a gravel alternative is the Hurley Road to the west, and then along the shores of Carpenter Lake. I haven't done that yet. Supposedly you can get 'before and after' T shirts for this road. I don't know if it is clear of snow yet.
- In Lillooet you might ask about taking back roads up the west side of the Fraser to the Big Bar ferry. This is a nonmotorized reaction ferry. There's a nice provincial park campground at Big Bar Lake.
- If you go up the east side of the Fraser, consider taking the 'shortcut' over the Pavilion hills (turn off at Pavilion). This is gravel with some good grades (14%).
- At Kelly you have the choice of a paved road to Clinton and the main highway north, or staying on gravel to Jesmond and the junction with the Big Bar road.
- A spectacular road between the Jesmond road and Big Bar is the High Bar road. This road has a 3km set of switchbacks that drop at 25% grade down to the Fraser river. Without low range you are likely to smell your brakes.
- you can continue of gravel roads all the way up to Williams Lake. There's a suspension bridge over the Fraser at Gang Ranch, and back roads through this massive ranch and surrounding forest all the way up to hwy 20.
- There are some serious 4x4 trails in the area between Carpenter Lake and Gang Ranch. Some of the BC 4x4 clubs have trip accounts online for this area.
And further north, just before the turnoff to the Cassiar, take a side trip to see the First Nations communities around Hazelton.
Some pictures from my travels in this area a couple of summers ago can be found at
http://www.pbase.com/paulj3/fraser