Just for information, in DRC, Kabila governmet has been capale to sent tanks from Kinshasa to Goma (nearly 2000 Km). For those who know the place it's kind of tour de force as there is less than 400 km of proper road in the country. It did take several month, mainly because that's the time it takes to build a track in forest... And they did loose at least 1 which felt in a river.
The same with South Sudan. Tanks are coming from Kenya. And the road from Kenya to Juba is chaotic at the best.

So tanks in no road countries may be done...