Dean Jones says:

"What are your concerns about your teaching load?"

Your response:

1.  "I'm having trouble balancing your teaching expectations with your research expectations. I can't have time to write and publish if I am expected to teach so much...What is the very best you can offer in terms of reduced teaching in order to facilitate my doing research?"

2. "I'm having trouble balancing your teaching expectations with your research expectations.  I want to make you happy, but I can't have time to write and publish if I am expected to teach so much.  Let's discuss your underlying interests:  Which is more important to you?  Teaching?  Or doing research?