Don't get too worried about the "weight police" people. It is true the advertised max tow rating is an extreme upper limit, and there are other factors like payload that might restrict the weight that you can tow.
Start with an RV show to find out the features and layouts you like. Once the must haves are a little clearer, it's not that hard to find similar units and/or to find a lighter weight or better quality version of what you are looking at. RV manufacturers copy from each other all the time.
Most manufacturers have different lines built towards different price points.
Have fun!