Probably been asked about 100x earlier, but going on a trip to Kruger this summer and wondering about adding to my kit or not. I guess some of you have been there and can give me a tip.

Current setup is the 5D III with the 24-70 II along with a 7DII with the 70-200 II. Would it be enough reach with the 70-200 on crop? I know people are saying you cant get enough reach. I also have the extender 2xIII I can use with the 7D but I don't know about image quality and AF speed? I heavn't been able to try it since the 7D II is currently incomming