slide out question

What system is your slide-out using? If it is the Schwintek, it will have tracks on the sides at the top and bottom of the slide-out box. Those should keep the slide-out moving pretty much evenly. If it is the one that is underneath, I don't know as I do not have experience with that system. I think as long as it isn't binding, but moving smoothly, the little bit of tilt should not be an issue as long as when it lands in or out it is straight.

I'm almost certain that a 2015 R-Pod would have a Schwintek slide. Does it have the aluminum strips at the top and bottom of the slide ends (that the gears on the drive motors engage with)? That's a Schwintek slide as StephenH indicates.

Mine was doing that and it because of a restriction behind the kitchen cabinets.  If there is anything restricting it will slow down one side.....I would look behind the pull out as it is going in.

I do not know the manufacture of the unit you have but it is the same as what I have on a 2011 177.  Mine does not act as how you describe yours however check the following:  look carefully at the under side of your slide and note if it is all in pristine (shiny black) condition or does it appear as though something is skidding, causing a worn pattern on the black surface.  If so, get a can of penetrant and spray the 3 roller ends (they are about 2-2.5" long) located just inside the camper wall, get underneath the slide and carefully pull the rubber gasket down and you will see them (using a flashlight will make the job easier). After spraying all 3 rollers move your slide in and out a couple times and see if this doesn't correct your issue.

So I took a quick look at the underside of the slide. One side is black and shiny, the other side is actually cut into the wood some. It's beyond just lubing up. It's not gashed really bad, but does not look good. I'd like to get a better look soon. As soon as I climbed inside work called so I had to abandon the investigation.