CNBC's Jim Cramer on Tuesday described why he likes online used car dealer Carvana, telling investors they can start a small position and wait for a pullback to buy more."I like Carvana for the long-haul because I'm a true believer, but that doesn't mean the stock will charge endlessly higher without taking some detours," he said. "In fact, I hope it gives you a big pullback, because that will let you get back into the stock at a very nice discount."Cramer said the stock "tends to be a real wild trader," bu ...