You can read some of my posts on the issues we have had and still having with our 2012 model.
If the rollers are not spinning then the load is being carried by the ones under the bed - this is probably a good thing. The outside probably help "carry the load" when the slide is in.
If the slide is going in and out without any 'abnormal' load on the front and rear motor then things are good.
On ours to fix the problem they removed 3 of the 5 outer rollers and installed 4 under the bed. Originally there were no rollers under the bed to it dragged while the slide was going in and out. This caused the failure of the slide operating system.
Now there are 2 on each end and the fiberglass is cracking under the bed where the rollers "carry" the load when the slide goes in and out. Parts are on order - re-install the three rollers removed and install steel plates under the bed slide "exterior" so they roll on the plates. This should provide protection for the fiberglass bottom and prevent further cracking.
Rollers installed under the bed on ours - this is with the slide out. You can see them if you remove the piece of plywood at the front of the bed and when looking under the bed with the slide out. You can see then if you look under the end of the bed with the slide out.
Factory picture:
These are the rollers under the "slide" portion of the bed - pictures I sent to cross roads - these are not carrying any load when the slide is out. You can see some of the mods I made so the bed does not pull out from the wall (factory picture Vs my picture)
My picture:
Rollers - 2 placed at the end of the bed - factory picture. I can not take a picture of the end of the bed - - but if you lift the end of the bed slightly when the slide is out you should be able to touch the rollers at the end of the bed.
Edited by: NorskeNY