Buy your last RV first. Don't buy on emotion. Emotion buys expensive mistakes which have to be sold to get the next one. Do the research. Will you be a traveler or a snowbirder simply following the warm weather?
Plan to see the country, do some special events like the Albuquerque Balloon Fiesta or bluegrass festivals, maybe a trip or 2 to Alaska? Going to need something comfortable but not a monster for that sort of thing.
Get yourself down to less than 6 possible models & stick to it, no matter what the salesman says or offers. Better to buy a slightly used recognised better quality trailer than same money for a new piece of junk.
Oh yeah, and buy the dually first. Don't waste the money buying a SRW then spend thousands for airbags & stuff to try to upgrade it. Look around the forum here. Nobody has ever regretted buying a dually.