As is my concern with other state schools, I would be concerned that not being a Michigan resident (assumption since you're attending UW... if this is not the case, ignore the rest of this paragraph) you might have more difficulty getting in. Most state schools show significant preference for in-state students and, while they may have some slots reserved for out-of-state (OOS) students, they likely are going to show some bias against them (holding them to higher standards). In addition, IIRC, OOS students in Michigan pay some outlandish tuition at MSU.
For any combined degree program, your GPA and standardized test scores will be important. You'll want to have some strong numbers to show them.
Clinical shadowing is a key aspect when applying to these programs. You want to demonstrate that you understand the career you're committing to. 50 hours shadowing a physician would be good, if you can do some more next summer before applying, that would certainly strengthen your application.
Just out of curiosity, do you have a reason for applying specifically to the BS/DO program?