Sport-utility vehicles became big hits with Americans looking for roomier rides, prompting automakers to roll out a range of models of different sizes and price points. Now, some dealers and analysts say car companies may have gone too far, and expect an overcrowded market to lead to deflated prices.

Sales of crossovers and SUVs are slowing, The Wall Street Journal reports, while models are sitting longer on dealership lots before being sold and companies are resorting to more sales promotions to keep inventory from piling up, analysts say and industry data shows. And yet, automakers are getting ready to roll out even more sport-utility offerings in the next few years, further packing U.S. showrooms.