Sorry ladies but it is funny!!!!!!
WE ALWAYS HEAR 'THE RULES' FROM THE FEMALE SIDE
NOW HERE ARE THE RULES FROM THE MALE SIDE
THESE ARE OUR RULES!
... PLEASE NOTE. THESE ARE ALL NUMBERED #1 ON PURPOSE!
1. MEN ARE NOT MIND READERS.
1. LEARN TO WORK THE TOILET SEAT. YOU'RE A BIG GIRL. IF IT'S UP, PUT IT DOWN. WE NEED IT UP, YOU NEED IT DOWN. YOU DON'T HEAR US COMPLAINING ABOUT YOU LEAVING IT DOWN.
1. CRYING IS BLACKMAIL.
1. ASK FOR WHAT YOU WANT. LET US BE CLEAR ON THIS ONE:
SUBTLE HINTS DO NOT WORK!
STRONG HINTS DO NOT WORK!
OBVIOUS HINTS DO NOT WORK!
JUST SAY IT!
1. YES AND NO ARE PERFECTLY ACCEPTABLE ANSWERS TO ALMOST EVERY QUESTION.
1.. COME TO US WITH A PROBLEM ONLY IF YOU WANT HELP SOLVING IT. THAT'S WHAT WE DO. SYMPATHY IS WHAT YOUR GIRLFRIENDS ARE FOR.
1. ANYTHING WE SAID 6 MONTHS AGO IS INADMISSIBLE IN AN ARGUMENT. IN FACT, ALL COMMENTS BECOME NULL AND VOID AFTER 7 DAYS.
1. IF YOU THINK YOU'RE FAT, YOU PROBABLY ARE. DON'T ASK US.
1. IF SOMETHING WE SAID CAN BE INTERPRETED TWO WAYS AND ONE OF THE WAYS MAKES YOU SAD OR ANGRY, WE MEANT THE OTHER ONE.
1. YOU CAN EITHER ASK US TO DO SOMETHING OR TELL US HOW YOU WANT IT DONE. NOT BOTH.
IF YOU ALREADY KNOW BEST HOW TO DO IT, JUST DO IT YOURSELF.
1. WHENEVER POSSIBLE, PLEASE SAY WHATEVER YOU HAVE TO SAY DURING COMMERCIALS.
1. CHRISTOPHER COLUMBUS DID NOT NEED DIRECTIONS AND NEITHER DO WE...
1. ALL MEN SEE IN ONLY 16 COLORS, LIKE WINDOWS DEFAULT SETTINGS..
PEACH, FOR EXAMPLE, IS A FRUIT, NOT A COLOR. PUMPKIN IS ALSO A FRUIT. WE HAVE NO IDEA WHAT MAUVE IS.
1. IF WE ASK WHAT IS WRONG AND YOU SAY 'NOTHING,' WE WILL ACT LIKE NOTHING'S WRONG. WE KNOW YOU ARE LYING, BUT IT IS JUST NOT WORTH THE HASSLE.
1. IF YOU ASK A QUESTION YOU DON'T WANT AN ANSWER TO, EXPECT AN ANSWER YOU DON'T WANT TO HEAR..
1. WHEN WE HAVE TO GO SOMEWHERE, ABSOLUTELY ANYTHING YOU WEAR IS FINE...REALLY.
1.. DON'T ASK US WHAT WE'RE THINKING ABOUT UNLESS YOU ARE PREPARED TO DISCUSS SUCH TOPICS AS FOOTBALL OR MOTOR SPORTS.
1. YOU HAVE ENOUGH CLOTHES.
1 .. YOU HAVE TOO MANY SHOES.
1. I AM IN SHAPE. ROUND IS A SHAPE!
1.. THANK YOU FOR READING THIS. YES, I KNOW, I HAVE TO SLEEP ON THE COUCH TONIGHT.. BUT DID YOU KNOW MEN REALLY DON'T MIND THAT? IT'S LIKE CAMPING...
PASS THIS TO AS MANY MEN AS YOU CAN - TO GIVE THEM A LAUGH...😂
PASS THIS TO AS MANY WOMEN AS YOU CAN - TO GIVE THEM A BIGGER LAUGH, BECAUSE ITS TRUE!....😉

I have been to 3 different Africa countries for safaris. Here are my thoughts on your questions.

1~check with the company you are going with. Some provide window supports, if not we bought bags of rice used a plastic bag to cover & then gave the rice to some people when we left. I don't think you need a monopod, hard to use in a truck. Some trucks you can stand up if it is open on the top.

2~I don't think you need both the Tamron 100-400 and the Tamron 18-400. I think I would go with the 18-400 since sometimes the animals are very close. Don't bring more than you will need. You might consider using the long lens on one camera and the Sigma 30 on the other camera.

3~I think that covers it all. I would suggest bringing a towel to cover your cameras when you are not using them. It gets so dusty so protecting them is the best way to go.

4~Another thought is to think about the Samyang AF 14mm f/2.8 Lens for Nikon. This is great if you want to shoot the night sky & milky way.

Here is an image from I took to Kenya 4 years ago. We all had long lenses on and this beautiful leopard walked right under our window. All we could do at the time was just watch her. Our friends were in another truck and took the image.
The second image was at the Elephant bedroom camp. This huge guy, Obama, was so close we could have touched him. My friend was in the next tent and took this image. That is me with the blue shirt. There was a security guard nearby.

What country are you going to?