What is this??? any idea what these are? The are located on the outside frame rail just below the driver side door, they appear to be batteries or something, can't really get a good look at what's on top but they look to be wired together.
Sent by magic, I mean come on really, pictures through thin air, MAGIC!!!
Hmmm.... they do look a little like batteries but it appears the black plastic boxes (batteries) are not sitting on the sheet metal brackets. It appears they are somehow suspended 1/2 - 1 inch. Probably doesn't help answer your question but it seems odd.
You didn't say the year of your van. The year may make a difference.
I noticed a sticker under the engine compartment hood of our 1998 van that indicates there is an additional battery for the van. Yes, there is a "house" battery but I think Airstream installed that. The label under the hood appears to be a factory Ford sticker. I have not seen an additional battery so I'm not sure what the sticker is referring to. Maybe your van has the additional battery(ies) referred to on the sticker. Do you have a similar sticker under the hood?
I've gotten quite a bit of free information from my local Ford dealer. I typically call the parts department and tell them the VIN (they want the last eight digits) then I ask for a part or give them a description of the problem. For instance, I wanted to replace the cabin air filter since many relatively new vehicles have a filter. I called to request the filter and they told me my vehicle doesn't have one. Maybe you can call and ask about additional batteries and see what they say.
Not much help I know but maybe it will lead you down a path that gets you an answer.
We sold our 1998 B190, V-10
Currently own a 2010 Airstream Interstate
any idea what these are? The are located on the outside frame rail just below the driver side door, they appear to be batteries or something, can't really get a good look at what's on top but they look to be wired together. 
