It's called the Gulf Stream Sun Voyager motorhome sunroom. The ad says it's patented, so no copying of their ideas.
Take a look at the windows in the ceiling of the slideout. Sort of cool.
"I have marveled often at the thin line that divides success from failure and the sudden turn that leads from apparently certain disaster to comparative safety." Ernest Shackleton, Antarctic Explorer, Sea and Land, 1874-1922.