So this was all I could find in the warranty booklet pertaining to rental vehicles (note - I pulled this for 2012 3500, but C&C appears to be the same):
I suppose some dealers will extend you a car rental as a courtesy, but this looks like Chrysler as whole does not.
If nothing else call:
Chrysler Customer Assistance Center
P.O. Box 21-8004
Auburn Hills, Michigan 48321-8004
Phone: (866) 726-4636
Out of curiosity, what happened with your truck?

I suppose some dealers will extend you a car rental as a courtesy, but this looks like Chrysler as whole does not.
If nothing else call:
Chrysler Customer Assistance Center
P.O. Box 21-8004
Auburn Hills, Michigan 48321-8004
Phone: (866) 726-4636
Out of curiosity, what happened with your truck?