Take care of your pod gpa, read F&A literature, excel in your science classes (esp anat/phys/path), and just learn to be an excellent pod clinician first and foremost. Unless that's "too easy" for you, I see no reason to split your focus.
The degrees mentioned would probably be helpful if you see yourself using them, but pod school in itself is hard. To be an excellent pod student is very very hard. I would definitely advise against doing a dual just for the sake of doing it (letters on business card, ego, etc).
A 3.0gpa pod student with a dual degree will probably be at a big disadvantage to a 3.5 DPM-only student.
If you decide tht you are going to do a dual while in pod school, you just have to consider your goals. An MBA is kinda nice, and it also sorta says "I know business and finance... don't F with me" when you go to negotiate a contract, buy-in/out, etc. The MHA would be good if you plan to be a hospital or clinical admin someday. MPH obviously has its focus also.
In line with this topic, a MSc in clinical investigation might be interesting also for those who want to be the real thinkers of our profession and read/publish a lot. You could even do a PhD if you are really that ambitious and dedicated to being a professional student. I believe there are a handful of academic residencies that offer the opportunity to achieve that research MSc degree (or similar), but this is obviously after the completion of the DPM program.