Camping in Jasper with small Motorhome

Whistlers and wapiti are the bigger campgrounds in Jasper, if you show up mid week with out booking a site you will get a spot, you would have to show up early.
Last year we were at Wapiti for 5 days in July and there were tons of empty sites.

There are a lot of travellers with rental units that only stay 1 nite and move on.
I wouldn't worry about it one bit.