Hi wildejbird,
If you would share how you plan to use the RV, and where you'll be camping, you're likely to get more focused responses.
For example, if you intend to live full-time in the trailer, you might find that storage space and holding tank capacity of a 31' unit would require some extra planning and effort on your part. If you plan on spending time in the unit during the winter in North Dakota, you might find it hard to manage the extreme cold weather.