This is a follow-up on my original posting about "squeaky floors"; I found a "fix" for this annoying problem!
I contacted Jayco and got drawing for my RV showing the location of the floor joists. Then, at my local Ace Hardware, I found a kit for fixing squeaky floors; it contains 2 plastic fixtures, a special drill driver, and about 40 special screws. This kit can be used on carpeted, vinyl covered floors or hardwood floors. The screws have a scored place near the head, so that as you screw them into the floor (using one of the plastic fixtures), the top inch or so of the screw breaks off, just below the surface of the floor. The treaded portion of the screw firmly holds the plywood floor to the joist, eliminating the slight movement that causes the squeaking, and leaves the top of the screw hidden just below the surface. Under carpet, the screw hole is not visible; on my vinyl floor there is a small hole, but the vinyl (that was pushed aside as the screw went in) does flow back and mostly fills the hole. I have to get down on my hands and knees to see the spots.
It was a quick and easy job (after locating the floor joists) and the kit costs abour $25. I'm pleased to get rid of the noise and my wife calls it a "miracle"!
I hope this helps someone else eleminate their "squeaky floor" problem.