Welcome lojo to the Newmar forum and irv2.
First picture is the slot where rods both ends of slide stops against the metal bracket looking head on under your slide.
Second picture is a side shot of same bracket with nut on backside tight to bracket.
The 3d & 4th pics are top of slide which you should check out and make sure the seals are laying correctly at top of slide and not stopping top from meeting the wall at top.
You may also have a locking bar that should drop in slot next to slide and not bind in slot stopping the slide from meeting wall at that location.
Your facia frame around face of slide in living area should not be bent anywere should be a flat 90* off slide box.
Your rollers should be ok because they drop on floor incline in wall area.
If you do adjust the stop nut only turn 1/2 turns after running slide in and out.