The retro is quite a bit bigger than the original 19 and 22 footers. That was my parents' first RV and then they later bought a GMC which seemed bigger at 24 foot. In retrospect the originals were closer to B size of today (and they didn't have slides.) BTW, they had louder generators back then too. Ask my former neighbors about that when my parents came to visit.
😄The trend for bigger goes across the board it seems (houses, stadium seats, Big Gulps, etc.) Only the airline industry bucks that trend.
😉 In reality, I don't think the auto manufacturers make a chassis anymore that you could build as small as the past for a Class A.
Davydd
2021 Advanced RV 144 WB 2500 Class B
2015 Advanced RV Ocean One Class B