Hi John!
Welcome to IRV2! We're sure glad you joined the gang!
That's pretty much a personal decision. We had been pulling a 36' 5er for 10 years before getting the MH, and wanted to have about the same amount of space. We figured that the 40' MH would provide that, deducting the cockpit area.
Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD