Shouldn't be a problem. In our '04 Cruiser main slide, we replaced the jack-knife sofa and free standing dinette with a lot more weight and never had a problem. We had a sofa with storage underneath, carried dog food, a sewing machines, bottled water, etc. Also storage behind the sofa with canned goods and other food items. Finally a computer table and chair plus lots of books. However, the majority of that weight was toward the outside wall and therefore resting on the main floor guide when the slide was retracted. If you are concerned, you could use some rubber or carpet cushions under the inner edge when the slide is in, just remember to remove them prior to opening the s/o.
Texas Baptist Men-Retiree Builders member since '01
13 Silverado 3500HD D/A, 2wd CCSB srw, custom RKI bed
11 Cruiser CF32MK