Welcome to iRV2
I went from a 5er to a class A , 5 years ago and couldn't be happier.
I'd say find a floor plan that works, and get on the road.
My truck and trailer measured 43' , coach and toad 58', took me about an hour to adapt to the longer rig.
Parking in a site and setting up takes less than 1/2 the time.
Main reason for the change was to get out of an RV with internal stairs, DW's knees are in trouble. Truck was high mileage and the coach cost less than a new truck, and with being in the RV 5+ months a year the 5er was getting to small too.