RV Repair: popup camper top, drive assembly, access panels

Question
I HAVE A POPUP THAT WHEN YOU CRANK IT UP THE LEFT REAR
CORNER IS HANGING UP WHEN ITS ALMOST UP. WHAT COULD IT BE ??????????????

Answer
In most cases with popup's it has to do with the cables. For some reason one of them may have jumped the pulley or something similar. These can be hard to locate but the best way to find out what the trouble is would be to open up the cable drive and take a visual look as someone cranks it up. there should be access panels to all areas of the drive assembly. I have seen in a few cases the standoff's or metal uprising arms causing this but not generally.