Kamloops RV Park is on the east side of the city about 15 minutes .
It is adjacent to the BC Wildlife park on the left of the hiway coming from the east. You may wish to call them for a reservation as every time I drive by there it appears to be quite busy.
there is also Sagebrush rv park on the north side of the river near to down town.
I would suggest try the Kamloops RV park first.