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Just a further thought, but even if it is the same auto box as the petrol variants, the engine characteristics are different with the diesel producing much more torque but at lower RPM's. It could just be a case of the gearbox being unable to handle the prolonged periods of high level torque that towing a heavy trailer with a diesel engine would put on it.
Then there's also the fact that the diesel donk weighs more than a petrol, and the auto box weighs more than a manual. It could be that the kerbweight of the vehicle is just that much higher than the other variants, while the gross train weight limit remains the same.
I forgot to ask: Does the handbook specify a 'driver only' limit and an 'all other cases' limit? If it does, and the 'driver only' limit is considerably higher, then the car is capable of towing that weight with a minimal payload in the car. You will still need paperwork from Renault to confirm that though, otherwise you may well find yourself on the wrong side of the law.
Currently in Horatio's garage:
2010 Laguna III Initiale.