The great news regardless of whether the big 3 make it through all this is that Cummins isn't owned by any of them so the engines would live on and I wouldn't have a problem buying a Nissan, Toyota or even a Fiat Cummins powered truck.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10