flyingfarm!
Our controllers were located on the passenger side in the compartment just in front of the rear dual. Of course Canyon Star is gas, but since another DS owner reported a similar location the odds are good for you.
Just a note on the replacement, I replaced the shaft on our bedroom slide early on, probably in 2010, it looked like it was overtorqued. Turns out Newmar had an issue with a whole bunch of driveshafts around that time, found out through posts on this forum that they ended up replacing others for no charge (unfortunately mine was first so I paid).
My control was already turned down all the way, it was definitely the driveshaft. The replacement worked well until we sold it, and I believe it is still working for the new owner (he contacts me with questions occasionally and sent me Holiday greetings a month ago).