There are some on this forum that absolutely have no tact. They don’t seem to know it, or don’t care. However, you can learn from what just about everybody says here. Sorta like that butthead teacher everyone has had.
The main weights that are important are payload for the TV, gross vehicle weights for TV and camper, and tongue weight. Dry weight of a camper is basically worthless as it is never anywhere near a real world weight.
Consult the Google if you need a better understanding of these.
Nothing wrong with buying used.
Ask away and sift through the answers. Pretty soon you’ll figure out what’s what.