Anything east side of the country is poor, as local Angolans say who ride offroad. Theorethically doable as Angolan oil economy blooms and Chinese build (but as locals say: paint-) roads there very fast (and those poor quality tar road degrade as fast as well). But as said before, be very wary in the wet-season - might be impassable.
15 days is a decent Angolan visa - other than suffereing on harsh trail conditions why not take the Namibia route, some bad paches of roads there as well, but you get to see many highlights of the country. This gives you time to see this very interesting country that most people just rush trough transiting with the 5-day visa. I really liked Angola despite I had problems (DRC visa issues), but found many good people there and lots of great time in Lubango, Luanda and Soyo with friends
Safe roads,
Margus
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