back when I dabbled in motorhome sales as a hobby, my understanding was that the number was the length, and the letter the floorplan.
in 2005, there were 32W, 33R, 34F, 35E and 36Z gas models. most of the lengths were 6-8 inches longer that the model length number.
the 33 ft model was dropped in 2008, and a couple 32 and 34 ft models were added. Then in 2010, the 32 ft model was dropped and a 33 ft model returned.
I'm sure that lengths and floorplans change as consumer interest change.
Andy & Lee + Molly, the 4 lb Chihuahua
2020 Tiffin Wayfarer 25RW...towing a
2007 Chevy HHR LT2 w/2.4L EcoTec,
Blue Ox Aventa LX, Brake Buddy Classic
FMCA #F359977 - Colonial Virginians, Past President 2012-14, 2018