I bought a truck during the great recession just before the GM bailout. Dealers were desperate to unload because they were unsure of status. Only risk to purchasing was that if they went into bankruptcy, warrantees wouldnt be honored. But i went ahead and purchased for 52% of MSRP. It was kind of funny because after the bailout the market stabalized and the used prices for the next 3 1/2 years were higher than what I paid new.
I doubt that prices will get that low this time around as bankruptcies look unlikely. But surely there are some excellent deals.
On other hand, all the rental companies are going bankrupt. So the used market will be flooded soon too. So that will be another great opportunity.