It’s still pretty early, I wouldn’t expect most dealerships to be in a dire situation yet. If this goes on for another month or two, that may change. I wonder, though, if discounts in the 25-30% range are possible on high margin vehicles. In my case, someone will probably buy that GMC at a price over $50k, thinking they have a good deal (and it would be). Factories are shut down, so excess inventory isn’t going to be a pressure to sell cheap.
also check if your insurance company is working.
Also, banks and credit unions. If a car is financed the bank must place it’s lien on the title, with a lot of dmv’s closed I doubt a bank would issue a loan under those circumstances.