Just a guess, I say around 156" wide with all slides out. Something else to consider on the 2013s, they came with a 20,000 weight rating on the rear axle. This severely restricts the load carrying capacity of the rig. Please keep this in mind. In 2015 Fleetwood increased the rear to 21,000 and in 2017 it was finally upgraded to 24,000 lbs.
Steve & Margo
2018 Fleetwood Discovery 40D LXE "Alice"