So I imported the AddTrustExternalCARoot and Intermediate/Issuing CA into the Certificate Trust List using the links you sent and that worked (!) - I am now able to successfully import my appliance cert.
But, is this legitimate to do or did I just create a security hole using (apparently) freely available CAs? I think I'm a bit confused on the public vs generated aspect of certs.
Are these acceptable to use in production or were these "generic" or "test" CAs?
BTW, you are right, I didn't download the chain when creating your certificate.
Thanks for the help...finger is hovering above the Kudos button!
-Mike