The Chargers have had some great running back performances in the last decade. Some were better than you might realize.
The title says "best running back seasons," but I actually compiled a list of "all (qualifying) running back seasons" of the last 10 years. Why limit yourself, right? Anyway, we are measuring "best" by Football Outsiders' DYAR statistic. For those unfamiliar, it accounts for context in a way traditional stats do not. It considers down, distance, location on the field, and quality of opposing defense. It then compares the results to a theoretical replacement level. This allows efficiency to overcome a lack of volume and punishes a player for accruing a bunch of yardage just due to high volume.