If it's a rack and pinion system, you can jack it up an inch or so when it's out. Everything will just rise and give slightly just as it does when the slide goes in or out and "nests". No problem unless you lift it so high it hits the wall over the top of the slide.
I think what you'll find is a piece of black seal rubs on the carpet. Sometimes that bit of seal is just extra that wasn't trimmed properly and sometimes it's very necessary. You have to figure that out.
Brake cleaner will take it out of the carpet and wont hurt the rug at all. You have to use lots as it just rinses away the black. Scrubbing with it doesn't work well.
If you have a Schwinntec system I would not lift it.