Showing up in an RV (rented or borrowed) is an easier entre to other RVers than as a cabin-dweller, but if you are the sociable sort you can wander around and chat up whomever is outside their rig. You will be able to tell quickly whether they are the gregarious type (many RVers) or would rather you went away.
RV shows are great places to see a lot of RV types & brands. Not so much for meeting RVers.
Forums like this one or IRV2 or a brand-related site like FROG (Forest River Owners Group) are good places to ask questions and solicit opinions. But recognize that you will be getting advice distorted by the various lifestyle-biases of the advisor. There is a wide variation in what's "good" or "right" depending on
your personal wants, needs, and attitudes. And your own preferences are very likely to change or grow as you gain RV experience. Or get older.
Since you have a few years to full retirement and already own a truck of some sort, I suggest buying a modestly priced used trailer and getting some real experience via weekend trips or vacations. That's the best way to learn about RV Life and how YOU want to fit in it. Plan on replacing that starter RV in a year or two, so it doesn't need to be a perfect choice or even the type or size of RV you think you will ultimately want. RVs depreciate rapidly but reach a floor in pricing where depreciation is no longer a factor and condition is only measure of price/value. You won't lose much if you start with an older RV and sell or trade it later.