Rapid City to Billings in a Day via Broadus

I have just read a number of threads in different places looking at the SupCs that aren't there in Gilette and Sheridan, though they may be there in the future.
And others have taken 212 through MT because it is a little shorter and Broadus has a NEMA 14-50.
So I want to check out what I am thinking to see if this makes sense and where I could go wrong.
It is 318 mi from Rapid City to Billings.
It is 150 miles from Rapid City to Broadus, then 168 on to Billings.
If I left at 8:00 am I could get to Broads in about 2 1/2 hours going 65 mph.
I started at the SupC in Rapid City, so I was full of energy and had 269 mi rating.
If there is any wind or rain or such things, let's say I get there with 70 mi left, I used 200.
Charging with my single charger for five hours should give me about 140 mi of range (5 x 28), totalling 210 rated miles. That should be plenty to go the 168 to billings at 65 mph.
So 2 1/2 hours to Broadus, 5 hours charging (6 if I need it), 2 1/2 to Billings to the SupC, totalling 10 hours, there by 6 or 7 in the evening.
Any problems with my travel plans?
Any better plans (like would it be better to go on I90 through Gilette for a 2 1/2 hr stop, then Sheridan for a 2 1/2 hour stop, then on to Billings)?
Thanks.

I am getting it, that is, getting that there are different ways to do this and planning differently makes things with an EV go a lot like they do with ICE cars (until we get more SupCs and it doesn't matter or the charging times come way down).
It makes more sense to try and get to Gillette for the night than to stay in Rapid City, you are saying, I think, because then I charge when I am sleeping instead of in the middle of the day when I am awake. Thank you, I am glad I could get that point.
I figured out something similar in my first (and only, so far) road trip, when my wife and I went out to breakfast with my son and daughter-in-law during a SuperCharge. It took "no time" to do the full charge because we were busy doing other things we enjoyed while the charge happened. I liked that. And I am sure I would like staying in Gillette so as to have a slower charge be while I am sleeping.
Thanks a bunch. Different way to plan my vacation, using an EV. And working to minimize the charging time to be when I am busy with other things (like sleeping or eating).

SWFiddler and Solarwind:
Where are you staying in Broadus?
Thanks,