If I was a beginner like you, I would look at the first part of each forum in what is called the Stickies. Usually one of the first questions in each Stickie is "How to evaluate....." and goes through the many many things to learn and know about when you look at an RV of any sort.
Just as an example, even looking at tires. Your comments are perfectly valid, but in the Stickies there will be one on examining tires. They all have a manufacturer date on the tires and that is one of the most important things to know.
This is the particular forum and stickie I think you will get the most out of.
Beginning RV'ing