i know yous is different since my KZ has a patent design and also a TT but here is what i did..on our 2005 KZ 2505. our rear slide out was sticking just before full slide out position. i smoothed the rails out with steel wool and WD40 to remove surface rust and also used penetrating oil on the roller wheels.. slid it back and fourth a few times and blew the wheels out with compressed air... it did the trick..i thought about using some type of greese on the wheels and rails but i think dirt and grime would be more of a problem.. i just routinly clean and inspect them.