Rich, IMO you are going a little over the top. there are a couple of considerations you need to think about, let me start with the technical ones:
1-. While the some of the equipment that you and and other are mentioning is fantastic (Ic 7100, HI-Q Antennas) remember you'll be traveling in countries where that equipment will definitely call too much attention to you and your vehicle. I would go a little simpler (Equipment wise). In my mobile rig I use an ICOM IC706MK2G, and I highly recommend it. Comparing it to an 7100:
- It's still an excellent equipment.
- Its just as capable.
- Has simpler electronics and does not heat up as much (the 7100 gets way too hot for my taste).
- Will call far les attention to you and your vehicle.
2- Regarding the Antennas, again give the plan you have, I do not dispute the fact that HI-Q and other mentioned make an excellent choice, but it screams VALUABLE ELECTRONICS IN THE CAR. Consider purchasing and taking tried and true Hustler Monoband whips, not because they are better, but because they are far cheaper, earlier to replace with any HAM in Africa, and will surely call less attention to your EXPO rig. You can take 10 mono band whips of every band you'll be using and still not spend as much.
3-. In my life as a HAM, im usually more focused towards versatility, because my focus is more geared towards EMCOMM and less DX so instead of taking one radio, i would take 2. Take the Multiband, but also mount a V8000 or IC2300 for a VHF, both are rugged and simple to use. This allows you to be permanently listening to the HF Call channel and be on 2mtr while on the road. with this setup you'll need 3 antennas 2 for the HF,VHF,UHF unit and a third antenna for the single VHF unit.
4-. I always place my V/U antennas on the hood of the car... in my experience IT WORKS.
5-. Speaking about Autotuner, I would stick with the AT-180, its a great piece of equipment and will definitely not let you down, mine has never failed on me.
6-. Even though most countries adhere to IARU international Band plans, remember to look up band plans for particular countries (some have restricted use of certain bands), its not a good idea to start transmitting in a government frequency.
6-. uli2000 has a good point, but instead of looking up the ARRL reciprocal permits... check with the RSGB. US reciprocal permits won't be much help to you.
There are other considerations you need to think about:
Apparently you have not made a final route or at least haven't told what it will be, but I would recommend:
1- In every country you'll visit there are HAMS ( I guarantee it), Look up the IARU member societies and radio clubs (
http://www.iaru.org/member-societies.html) Ahead of time contact them, ask them about local regulations with equipment, particular border crossings, and ask them about their repeaters. This will give you great coverage and peace of mind while in route. All (or most) hams speak english so you can have friendly chats while in route, if you have equipment failure, you already know who to call and assist you, tell you can get help or anything at all, the point is HAMS are usually very helpful people. Before someone else corrects me, Yes, you won't always have repeater coverage but its better than not having it.
2- I would definitely take a cheap unlocked and rugged cell phone will give you the ability to buy a chip in most countries and have a somewhat inexpensive calls.
3- SATPHONE - there are pros and cons about it some of which has already been discussed, but other than that, IMO most SATPHONES aren't well liked by power hungry police, military and border crossing personnel, there is something about sat phones that just they don't like that much. If you want to take one, by all means take it, but again make it one that doesn't call too much attention.
4- As with HAMS, there are EXPO, overlanding, and fans for whatever brand car you'll take (MAKE CONTACT ahead of time, having local assists will help).
Hope it helps!