Pete,
I have an L6 which came with all original documentation and like you in the manual I found no weight. However, I also have the seperate specification leaflet which gives the approximate weight of the 24" as 1540 lb or 698kg and for the 40" (how I would love one of those) 1708 lb or 775kg. The 24" copy version is 1736 lb or 787kg and the 40" 1932lb or 876kg. I think those weights are pretty accurate for the machines as they also give the size and additional weight of the packing cases!
Mine is the 24" and we had to extract that from a shed down a garden on a hill and then roll it out to the road on pipe roles before picking it up with an engine crane (which was on its limit) and roll a 750kg plant under it. It certainly sat the trailer down on its haunches so again I would say the above weight is pretty close to the truth.
Hope that helps.
Paul.