Eric there is nothing wrong with selling cars. It is an extremely difficult job with long hours, and pressure from all sides (customer and management). My point being, you can not help but be biased.
I know there is nothing wrong with selling cars. But your demeanor suggested otherwise. I don't care if your a priest, teacher, or whatever. Every industry has negative stigmas associated with it. I think it shows lack of character implying you are better someone because of what you do for a living.
I may be bias (I don't think I am) I'll give you that, but it doesn't change the facts of basic economics. Supply and demand is indifferent from industry to industry. When dealers don't have vehicles (supply goes down) then prices will go up (because demand goes up).
So here is why I am saying this:
One an average month of May I would have over 650 new vehicles in stock (with 11 -12 Land Cruisers). Right now I have 252 new vehicles in ground stock (5 Land Cruisers - 4 of which are sold pending build completion). Point being.. who that is 60% down in inventory would start cutting priced or take unfair offers? I don't know where you are getting your information from but I would carefully select your sources and dates of those source before pretending to be an expert.
You mention "the only reason dealers offer 0% was to keep new car priced high". First, dealers don't have
any say who gets 0%, the manufacture does. Secondly, that doesn't make sense on any level. 0% APR is a tool to sell slow moving vehicles..
You say that there is a huge "back log" of used car inventory because auctions have been shut down. Although true physical auctions were/are shut down, online auctions have only increased in popularity. I'm not in charge of vehicle supply management nor privy to all manufactures, but I would guess that Toyota sells 99.9% of it's wholesale (off-lease, demos, etc.) via online auction even pre-COVID19. So not that it is 99.999% that doesn't add cause to your point. The only cars that would be sitting at physical auction are the worst of the worst crap piles out there that most franchise dealers would not be selling anyway.
Back to the OP thread title: how does Hertz effect this.... My opinion is ZERO. Hertz failed because they had 25 billion in debt. If it wasn't COVID19, it would have been something else eventually. This is what happens the company is relies on accounting and consolidation to keep quarterly earnings statements high for shareholders.