For what it is worth, I've done successive days of 127 and 139 miles on a touring bike with about 15lbs of gear in rear panniers. Fair amount of climbing on the first day, less on the second. It wasn't a huge problem, though I'd have liked it a lot less with a strong headwind.

So there's no reason why your plan shouldn't work. The trouble with really long days of this sort is the lack of contingency should the unexpected arise. Then they become very long days indeed. But go for it, why not?