What type of slide out is it?
Hydraulic
Power gear rack and pinion
Other
On the power gear there are assorted adjustements. If you are SURE teh floor is out all the way and in good condition (more on that in a bit)_ you can adjust the height adjustment at the outside end of the "Racks" (long toothed rails) lowering it should "tip" the top out.
Now if the floor is NOT in good condition it may have tipped in due to a bad floor. Happened to me last summer.. New floor section needed.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times