Welcome! We also just transitioned over from a 39' fiver (Montana) to our first MH. What my DW noticed the most was we ended up with a little less cabinet space inside. What I noticed was that instead of about 60 square feet of storage under outside, we now have well over 200 square feet. And of course going down the road with a V-10 gas engine under you instead of a big diesel will be very different also.
We are sure happy with the switch though, and I am sure you folks will be too.
Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO