Just to give you a clue. It is not a steamer and quite right the engine is a later addition. The thing that you see on the back is a winch! (we must assume that it was not for self extraction).
Without giving too much of the game away, it is now too far gone for restoration, although it has some useable parts, most notably a diff!!! The problem will be getting it out and away. It would be impossible to get the whole truck out, so maybe that is a good thing.
In answer to the other questions, no it has nothing to do with us. We are very privellaged to meet so many nice people who have the same interest as ourselves. The people who collect trucks from the WW1 era do seem to gravitate together and share photos, information, finds and horror stories. The internet really is a marvellous tool.
Any more guesses as to the chassis? I know of two regular posters who will know for sure.
Tim (too)