Are you now planning to make this trip in 2 days? If that's how I'm reading your current plan, you've pretty much eliminated your ability to add in the kind of scenic drives and detours you've talked about wanting to take.

Milwaukee to Memphis is tough to do in a day, being more than 600 miles, It will be at least 11 hours, and likely more. The 9 that Google shows you is a complete fantasy.

To get from Memphis to Dallas via the scenic detours you're talking about would mean at least another 550 miles the next day. That's 9 hours via the freeway, but you'd easily be adding several more hours if you want to start taking scenic drives you've mentioned.

Basically, you'd be so pressed for time, you wouldn't really be able to enjoy the detours, which are your reason for adding the extra miles in the first place. If you want to make this trip in 2 days, it becomes a trip where you really just need to focus on getting there.