Thought I'd update this with my experience.
I was really happy with my decision to bring the Nikon 200-500. I was able to hand hold it all the time; ended up never using the clamp or the gimbal (waste of weight, oh well!) There were just a few times I wish I had that F4 (we actually had a lot of afternoon rain and cloudy skies) but the flexibility of the 200-500 made up for it. I was even able to use the 1.4 converter a few times with this lens and it held up well enough.
Porini Lion filled my Molar bean bag, no problem (never bothered to fill the Kinesis as there were ample bean bags for hubby to use.) We ended up with a private vehicle at Porini (just due to the configurations of the other guests that were there--we got really lucky!). The private vehicle for the rest of our trip was outfitted with more beanbags of every type and shape then one would ever need.
The 70-200 was mostly on the D810 but I often put it on the D500 when I needed a faster aperture and things were close enough.
Only used the flash a couple of times. Due to a lot of rainy evenings, we only did two real night drives the entire trip. It seemed every time we set out for one, it would start pouring rain. Also due to this weather we had none of the famous Mara sunsets So I only used the 24-120 a few times as well. I think for my next similar trip I may get something like the Sony RX-100 or the Nikon DL (if it every comes out) to use for scenery. The Nikon V2 got used a bit for camp shots but not very much for scenery--I didn't have the right lens, as it broke just before the trip and I decided not to replace it.
Anyway, bottom line I was really happy with the 200-500. Its really a great lens, and it held up fine in all the bouncing and dust (which was one of my concerns.) Anyone want to buy a very nice Nikon 200-400 F4? (Seriously, I may sell it, but haven't quite committed to that yet.)
Plenty sharp at 500mm....
Edited by janzin, 26 October 2016 - 09:52 PM.