"If you're not enjoying this industry [now], then you ought not to be in the car business," Carter added. "This is really as good as it gets."
November provided a demonstration of the market's strength. The 11th month of the year used to be one of the quietest, but last month's sales rose 1.2 percent to 1.32 million vehicles, making it the strongest November total since 2001.
Toyota Motor Sales U.S.A., Fiat Chrysler Automobiles and Nissan North America all saw growth of 3 to 4 percent. GM reported a rise of 1.5 percent, while Ford was essentially flat and Honda saw a 5.2 percent decline.
November's seasonally adjusted, annualized selling rate was 18.16 million vehicles. It was the third month in a row that the SAAR surpassed the 18 million mark, and the seventh month in a row that it was over 17 million. In only three months this year -- January, February and April -- was the sales pace below that level.
"We keep waiting for the bottom to fall out, but it doesn't happen. The market just keeps going," said Doug Waikem, whose family owns stores selling seven auto brands in Massillon, Ohio. "This is just a good, steady market right now."
Barring an unforeseen drop in sales this month, total volume for 2015 is on track to come in at around 17.4 million, the sales record that was set in 2000.
Another year or two at that level would give dealers and manufacturers a very healthy environment to operate in, but would still present some challenges.
One is that automakers will have to be precise in guessing which vehicles consumers will want to buy, and calibrate their production capacity accordingly, to avoid shortages or profit-killing incentive spending -- "how many sedans versus how many SUVs versus how many pickup trucks," Carter said.
Sales of light trucks, thanks to booming sales of small crossovers, increased 9.4 percent in November and represented 60 percent of the total market. Sales of subcompact crossovers such as the Buick Encore and Jeep Renegade more than doubled.
Pickup volume was driven by midsize models such as the Chevrolet Colorado. That segment's sales rose 17 percent. Full-size pickups, meanwhile, offered mixed results. Ford said it set a November record for F-150 sales; overall F-series sales rose 10 percent. But the GMC Sierra, Toyota Tundra and Nissan Titan all saw their sales slip from a year ago.
A steady, low-growth environment would be a dramatic change from the climate of a few years ago, when sales were increasing by a million units a year. Without much growth in overall sales, brands that have set goals of increasing their market share will have to do it by taking customers from competitors.
Nissan, for one, has vowed to expand its share to 10 percent of the U.S. market. So far this year, it has 8.5 percent.