There are just so many choices to make. A lot depends on your intended usage. Once you define that, for example: kids? pets? cold weather or not? single or double pane windows? pavement or backwoods? how many sleep at once? how many eat at once? cooking facilities with oven or two burners?
Then you look at weight. Weight by length usually means quality of construction. Notice different models by the same builder usually get heavier with model upgrades.
Keeping it under 7000 gross can be limiting, or if you have the $$$ for a fiberglass unit it can be easy.
Lots to consider, but that should help a bit. Put down your requirements in more detail and people will respond when you start comparing different brands and models.
