Different point of view ....
In my experience, it's the front tire that either makes riding under difficult conditions fun or not. With difficult, I mean mud. Stones, gravel, that kind of stuff you do not really need nobblies for.
Sand dunes are another story altogether of course.
But, back to mud: having a road tire on the rear and a motocross tire on the front you'll still have a lot of control and make relatively good speed.
So, my advice is, start out with 'road oriented' nobblies, like Michelin T63, or others, and bring a new front motocross tire for the difficult mud parts. The T63 rear lasts 10 000 kms pushing it a bit.