Research can really pay off. We thought it over for a couple of years, went to shows, searched the net, and got familiar with the class B pros, cons and brand names.
I'm now a fan of talking up what you're looking for to friends and those in the business. Because we mentioned our search to an RV repair place, we found out about a low mileage used B a few miles away that had just been put up for sale by owner. We'd never seen that make but already knew the manufacturer had a good quality reputation.
If you do find a good one, don't dilly dally. Later the same day we put a deposit on ours, two other peope who had driven it called the guy saying they were ready to buy.