As of now, I don't have any plans to mess with vaccines or prescription meds; I'm not licensed to drive around the US with them in my car (that would end a trip quickly!). I'm going to stick with supplies that aren't temperature sensitive like syringes, bandages, equipment, etc. Down the road, maybe? But for possible future reference: I've looked for flexible solar panels, and the brands I'm familiar with (I'm a marine electrical technician by trade) in the boat industry are around $400 US for a 12W panel. A little pricey for 12 watts of power- any cheaper alternatives?. Again, as of now my alternator will be running most of the day on a trip. And my power consumption should be close to nil at night. The dual battery setup I'm going to install in the next few months is mostly because it's an electrician thing. I get the parts at a discount, and with the automatic charging relay I install between the batteries I can jump-start myself if needed. Or keep my stereo/computer components going while I crank the engine. It's more for fun than a necessity. And it's something electrical I can do on my FJ while I'm at work; I'm stuck with mechanical maintenance now, unlike my Land Rover that kept me busy on both fronts.
Hltoppr: by "birf job" do you mean grease the birfs, or replace?
And I've dropped a few things from my previous list. With the water pump- I already have one that I was planning on installing. Should I install it before I go and take the old one with me, or leave it and bring the new spare? I have no reason to believe it's not in good shape currently. Thanks folks!
With carrying meds it really only is the narcotics and radioactives that cause much problems. I wouldn't touch them if at all possible. The rest is easy to go through the hoops for transporting. Get the needed licenses from the countries you wish to work in. NOTE: Some medicines really need to be transported in sealed containers so there is no chance of it breaking in an accident and becoming airborne in your vehicle. Also I'd keep all medicines boxed up in packages labeled for their destination. That way it really looks more like a shipment. Have a printed inventory for each package. I think for transport in and out of the US you will need that inventory. Do stuff like have your letter head and organization ID cards. The more you make it look like a professional run operation, the more likely you won't have problems with the authorities.
If you have to have a solar panel, just get ridged ones. All of the flexible ones are poor for output per area. Sanyo HIT series has the highest conversion rate in a consumer available panel but you have to get a 186W or larger panel.
BP is also good and has smaller panels. Also consider your charge controller. A MPPT type charge controller will extract allot more out of the panel and be likely worth it in the long run by reducing the size of panel needed. If you don't want to buy a MPPT controler then get a PWM one. You'll be giving up 15% to 30% of available panel output over a charge cycle, but that's life. Also I don't think a PWM style will charge at all while you are driving. This is due to the truck's voltage regulator being set to a higher voltage. In fact I bet many of the MPPT ones also won't charge while driving. This is why I feel it may not be worth it. With the MPPT style controller it is better to have a high panel voltage as it can make very good use of the higher voltage output. This argues for having two smaller panels and putting them in series. With a PWM style controller you need to match the panel voltage to battery voltage.The dual battery is a necessity to keep you from having to get a jump start in the middle of nowhere. It isn't a fril.
On the water pump: If you have to go into it's area for other repairs, replace it. Also if you are experiencing overheating issues also replace it. Otherwise I'd keep it as a spare and make sure you have everything needed for replacing it in the stix.

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I had after some of your advice, I contacted a Mission in southeastern KY that I had been to when I was 5; my father volunteered seeing patients in the clinic. I received confirmation from them today. Then I sent out e-mails to a bunch of friends/family/contacts tonight asking for help to fill the back of my cruiser with school/art supplies for the Mission's school. This works out well for me: my wife is an art teacher, so I'll have a little extra help. It's about 8-9 hr drive from here; no big deal. So as soon as I get enough stuff, I'll drive it down and drop it off. Spend a night cruiser camping, maybe a little hike thrown in? So I'm pretty excited! And I'll keep ya'll posted on the progress and outcome.