You might be surprised how many vehicles are sold each month. I knew the DMV data at one time for the Hastings/GI/Kearney tri-cities area, but it's in the 1,000-2,000 per month. Lincoln has a couple dealers that sell 150-200+ new and used per month.
Just don't feel sorry for dealers. Every single one of the took hundred of thousands, and mid to large sized franchised dealers took multi-millions in PPP loans which were forgiven because of horrible April/May/June. However, the last half of 2020, they all had some of their best months/quarters ever. It's main issue on why we're in a new and used vehicle shortage. Manufacturers didn't think they would sell as many new vehicles as they did in late 2020, so they cut manufacturing and cut back ordering parts (chips).