Not sure what make a KS may be (Kountry Star?), but there are mostly likely numerous staples, per myboyer's experience (and mine too).
Vinyl plank is easy enough to work with but any RV is a relatively hard place to gain your first experience with flooring. Lots of fitting around things, especially around stair wells and such.
The key thing is to be careful about the height under any slideouts, making sure their is clearance. Also, many slideout designs actually ride on the floor as they move in/out (skids or rollers underneath) and that will scratch vinyl if it is not protected somehow. Sometimes a piece of vinyl sheet is all that is needed, slipped into place when the slide is moved.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC