Removing Base from Frame

Hi! we are in the process of rebuilding our 2006 Dutchman CS. I've found some great info on floor replacement/fixing frame, which will be super helpful. Last year when we got our fixer upper and I was doing some research I stubbled across a YouTube video of someone showing how to remove the base from the frame. Unfortunately, I forgot to save the link. Now as we are preparing to actually do the work, I can't find the video....does anyone know what I am referencing and be able to point me in the right direction? Or if you have any tips/tricks to remove the frame, that'd be super helpful!