Ease of towing an 8-ft wide trailer vs a 7-foot trailer

I am a bit late to this thread but I do have a suggestion. Since a friend has the Casita, perhaps he will allow you to spend a weekend in it at a local campground. He could even pull it over there for you and set it up. This will help in the decision making. First of all, is this sufficient room for the manner in which you intend to use it? Major consideration. Be sure to use ALL SYSTEMS on board.
CCC