Hi TCdude
I have owned a 2001 Lance 1121 and sold it last year(April of 2014)when I pulled the trigger on a 2014 Lance 1172. There is not a single system on that 1121 that I do not know about and its a fine Camper.
There is NO problem with the slide mechanism/slide motor/nor is there any problem with the slide room itself.
The problem was with the main wall wood frame structure that supported the booth style slide/out room. In a nutshell there was not enough frame support in the main wall - underneath the slide/out room on the main wall.
There is an easy way to see if it was repaired properly as all you need to do is look from inside the T/C,,, underneath the slide/out room and see if there is a thick metal brace that goes the entire length of the floor and up the left and right side walls about 15 inches or so.
Lance Cal. did mine and replace the entire main wall as well at no charge to me.
In the 12 plus years I owned that T/C, yearly caulking and general maintenance kept my 1121 in great shape. I had one other major issue but that was because I had a terrible accident at work in 2006 and was out of camping for quite some time and a seam open up on the driver side nose resulting in water intrusion. $5500.00 later all was repaired and my Lance 1121 gave me great service.
Mike Tassinari AKA Mikeeeeeeeeeeeeeeeeeeeeeeee