You sound like me. I am not worried about a failure but, wanted to know how to do it. Salesman said do not worry, there is a motor opposite the side, you get to it from under the trailer thru the inclosed under belly. That was lots of help, right. I found a Keystone site that shows and explains the slide systems and how to move slides without power. That was several years ago. Unless someone knows your trailer and can help. Try that, it was in the factory web site.
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed 3.55 rear end lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.