Will your family survive the trip? Those are pretty tight accommodations for 5 people. Where are you going to stuff all your things for a year? Class C's have lousy storage. You'd have a better chance of success in a Class A. Are you a good mechanic for when your RV takes a dump?
Are your kids really willing to leave their friends and activities for a year? I remember taking month long trips as a kid because dad wanted to visit his family out of state. My brother and I wanted to stay home with our friends.
2013 Chevy 3500HD CC dually
2014 Voltage 3600 toy hauler
2019 RZR 1000XP TRE