As you no doubt know some continental vans come without a battery.
This one looks like its Nuclear powered with pic 1 showing the spare fuel rod storage and pic 2 the reactor vessel under-slung to save space and pic 3 is where you top up the heavy water level.

This is naturally just a guess of mine and I may well be wrong

I have seen this arrangement on a Brit Eriba at an EOC do.
The drain pipe was for keeping windbreak and poles.
I also know a motorhomer with the same arrangement for his fishing rods.
Much prefer the reactor version though.

The tube is a baguette or sausage carrier

I think it's used for cross border smuggling of old masters like Van Klomps Fallen Madonna with the big jockey wheel.

Sorry I was only kidding before

pic 1 is a sideways torpedo launcher to prevent overtaking by white wobble boxes (launches to either side depending on which country you are in)

pic 2 is torpedo storage (you do have to stop to reload though)

pic 3 is a bulk storage tank for wine (handy when visiting vineyards while touring France)

Just the thing for the annual Randa trip

Yep, item 1 is definitely a Mk2 wire-guided torpedo circa 1975. These were the first torpedoes to use fly-by-wire technology and meant that basically if the shot missed you were able to pull it back into the tube and have another go. I hope nobody thinks I'm joking. Item 2 - a bit tricky this one as it's definitely non-military. I suspect, however, that in combination with item 1 it's a Hazchem pack containing Dry Powder extinguisher, a chemical protection suit and a list of instructions detailing steps to be taken in the event that item 1 runs amok. Rumour has it that it wasn't in fact HMS Conqueror that sunk the General Belgrano but a misfire from just such a van happily camping and totally unawares in the vicinity of Port Stanley.