Carvana (CVNA) had a bumpy road that led the stock to more than 125% year-over-year gains. An upgrade from Jefferies calls it a "best-positioned" stock in the used car market as the company drives toward a new all-time high. Rick Ducat shows how Carvana stacks up to peers like Carmax (KMX), which saw steep selling action after earnings. He offers a detailed view of the company's key levels and options activity.