Take your time, don't be in a hurry. Go look at Class A and Class C, new and used.
Sit in them, walk around, act like you're cooking, etc.. Can one of you walk past the other while they are cooking/washing dishes or doing some other chore?
Try all the seats, are they comfortable, can you easily see the Television. Is there room to use your laptop, etc.?
Consider where you will store your food/beverages and pet food.
Where will you put the litter box?
Where will the animals sleep? Maybe bunk beds will be a better choice?
Make sure the floor plan works for your lifestyle.
Look at everything before making a decision.
I also doubt you will find an all season rig that will take the Alaskan winters. That's not a problem. Many keep their rigs ready to go but, not filled with water. They just wait until they get to a warmer area before they dewinterize and fill their tank with water.
Don't hesitate to ask questions on the forum. There is a lot of information an experience available.
Enjoy your search and future travels.