Africa trip - teleconverter needed?

My wife and I are traveling to Tanzania next month, and we’ll both be using Nikon Z8s with 100-400mm lenses. I already own a 1.4x teleconverter, but she doesn’t have either the 1.4x or 2.0x TC. Would you recommend buying or renting another 1.4x TC or would it be better to get the 2.0x TC?
I’m also considering renting the 180-600mm lens. Which option would you recommend for a trip like this? Any insights or advice would be greatly appreciated!

Hi - we have been to different parts of Africa a number of times.
Take the longest lens you can acquire! My Sony A1 wih the 200-600 was not enough in many instances, and if the light permitted, I added the TC 1.4. In the bright , harsh light of day, you can get away with a TC 2.0 .
You would not regret having the 180-600 if it is highly rated and sharp.
This is an expensive trip of a lifetime, so I’d urge you to not skimp on equipment.
Have fun!

Great, thanks you for the information!

Can’t speak for the Nikon Z converters but F mount I have found the 2.0 to be all but worthless with long zooms… autofocus is horrid. I’d put my money into the 180-600 before TCs, although maybe the 1.4 is good for Z mount? At the very least, purchase (or rent) soon and do some extensive testing in the field before you make the trip. I’d much rather crop extensively than come away with unusable, out-of-focus images or entirely missed opportunities.

@timbata You could rent a TC from Lens Pro to Go if that would be an option. That way you don’t have to purchase. Maybe even rent a lens as well. Renting the lens would likely be cheaper than purchasing and then if you like it and it worked well, you got your money’s worth. Have a great trip!