The bed frame is on gas charged shocks. Just lift the foot of the bed up. The shocks might be weak (something I had to replace) but you can use a broom handle to keep it from coming back down.
There are two panels on the floor. One big flat one on the floor and one that is smaller and higher. It is a one piece angled cover right below the closet. You should only need to pull the smaller one up. Take out all of the long bolts (use a drill or impact as they are about 4 inches of thread). Then grab it at the edge where there is a bit of a lip and pull upward. You'll then see how it will come out. The the verticle piece of carpet under the closet that covers the verticle part of the cover is not attached to the cover itself, so just hold it out of the way. The only real tricky part is when you are reinstalling the cover and getting the bolt holes lined up again. It will require some fiddling and maybe moving the cover around as there is some play in it. You have my number if you need a "real time" talk through when you do it. Once you do it once it will be a snap. Good luck!
P.S. Have an old blanket or piece of cardboard etc to set the cover on once you pull it off. It will be dirty and grimey underneath and you'll be standing there holding a 30lb cover going, "S#%T where can I put this now?".....or at least that was me....lol.
2008 Berkshire 360QS-40
"If you can't fix it with a hammer, you have an electrical problem"