The maintenance of a Sell rating by Goldman Sachs suggests a negative outlook on REV Group's stock, indicating that the analyst believes the stock might underperform the market or its sector. However, the increase in the price target from $18 to $20 could imply that the downside risk might be less severe than previously estimated, or it reflects a slight improvement in the company's fundamentals or market conditions. This mixed signal could lead to short-term volatility in the stock's price as investors digest the implications of a higher price target against the backdrop of a Sell rating.