I found this picture on Ebay. I think it's one of the trailers used to transport 30.5cm Skoda M11 or M16 howitzers. However, this weapon was carried on 3 loads: base trailer, carriage trailer and barrel trailer. I've seen pictures of these three trailers and none of them resembles to the trailer of my picture, which also has a crane (I suppose it would serve to handle the ammo).
The pic illustrates the Bettungswagen as it appeared in battery. This is the wagon that carried the firing platform. The platform was in three hinged pieces, and "folded" over the two squared pedestals you see behind the pompous seated crew member. The wagon also carried a dismounted crane that was installed for handling the propellents. After the piece's set-up, this wagon was positioned so as to allow the crane to traverse to ammunition lorries, and unload the rounds. It then lifted each round onto the railed hand cart for manual movement to the piece.
Thank you very much for your information, 28juni14.
I think you're right
I have the book "Skoda Heavy Guns" of Michal Prasil. This book contains two photos of the Bettungswagen trailer of 30.5cm Skoda M11 morser, but none of them I can see the crane anywhere.
What's the thing at the top of the two squared pedestals? Trunks??
They appear to be cut timbers. As you will note, it's a winter scene and much of the ground seems to be turning a bit mushy. The crews have laid boards to keep their ammunition clean, and the timbers were likely to assist traversing ditches or uneven terrain.
I have achieved today another photo of a 30.5cm Skoda M11 base box trailer with a crane mounted.
Just another question: the crane was transported in the same base box trailer disassembled or it was transported in another vehicle / trailer and then mounted on the base box trailer in position??
The crane, the heavy jacks, wheel guides, recuperator pump, propellant cart, gunner's aiming tools, and various other accoutrement's, were all carried separately in the towing vehicles. Those vehicles , purposely designed for the M11 morser, were Austro-Daimler M12 zugmaschinen.
Indeed this is strange. You will note the rohr, still in iit's cradle, is carried upside down, suspended between the axle carriers. One would have to assume it is a field expedient . Thanks for sharing.