I have $20,000 cash right now.. Can I afford this??

The used TC market isn't like cars.com where you can search a brand and model and color and set of options you want, and get a long list of candidates.

Looking for a specific brand/model/year of USED camper will make finding a camper a long frustrating process. The market is too unpredictable for that unless you are willing to drive any distance and pay any price.

Just go shopping. Look at what's out there. See what you like in your price range. Go on condition rather than brand or resale value.