I had to buy my own water pressure regulator. Guess I should throw it away now since the manufacturer did not provide one!:B That's kind of silly though, trying to out-figure the manufacturer! :E
Serious... if your camper is on a seasonal-permanent site, the slide stabilizers may be a benefit, provided your camper is stabilized itself very will. But, if your camper is (mobile, meaning you movie it a lot), I think it could cause more problems than it's worth, especially the risk of the trailer shaking and moving and the slides cannot shift with the body of the camper.
Edit ... remember, your slide is not only supported from the bottom (the floor), but it is also supported at the top. Otherwise it would fall out! Your slide is much stronger than it appears. I don't think you have any problems with the new furniture.