Who told you Winebago was slipping in the ratings. They have won the excellence award for as long as award was out there. They aldo built a quality coach, have great service advisors at Factory when needed, they manufacturer the parts at the factory other than appliances and electronic equipment.
What did National do except bang it up. There are a lot of Winnebagos out there including their top[ of the line in DP a Tour or top of the line Gas unit the Adventurer plus all the Rv's in between.
Sure Prevosts and Newells are fine coaches if you are independently wealthy.
I also wouldn't put the coaches in the ranking that the original post stated.
There I said my piece.
2014 Winnebago Adventurer 35P,Ford F-53, V-10
2011 Ford Escape,2000 Roadmaster Tow Dolly
"Have a Great Day, Enjoy RVing."