Good evening Shipmate,,, If you plan on full timing it I would recommend spending a little more money and get a fiver that will keep you and the wife comfortable with better hardware and creature comforts. The heavy rv's do keep out sounds at campgrounds when you are trying to sleep. The interiors are a little nicer on some of the Mid to Upper level fivers. Not sure what you plan to tow the new fiver with, but you will want something comfortable as well.
There are a lot of light fivers, but you may not be able to get some options like automatic leveling or washer/dryer hookups. You are smart asking questions now. It will be too late once you buy your new unit. Welcome to the forum and if you have any other questions, just ask the Chief...