Regarding the two posts above, Robert describing his Airstream as a "travel trailer" and happiest camper discussing windows, I would suggest these are a couple of the features of trailers that new folks would do well to consider when shopping. How we use these RV's has an effect on how satisfied we'll be.
I too use my trailer to "travel", and spend 5 to 7 months a year in it, so it was important to me to have an interior that is comfortable for me. When you're on the road that much, you spend a lot of time inside.
By comparison, if all I did was weekend "camping", I'd be spending most of my time outdoors, so I would have different needs for the "inside" part of the camper.
Windows....ah yes, I wanted windows all around not only for ventilation, but letting light in.