Looking to buy my first RV. I am stuck between a 22 ft and a 26 ft. It is me and my 2 boys (14 and 10) and a chocolate lab. I know the old saying, "your first rv will not be your last." I want to get one with plenty of room but I don't want to be hauling around too much RV. The 22' is fine now but as the boys grow older are we going to be cramped? Are there other factors I should be concerned with? Thanks in advance.