Richard,
We have an 1800Kg twin axle caravan which we tow with a current model Sedona diesel auto.
It's an excellent outfit, the Sedona is a vastly superior towcar to our previous MPV (Toyota Previa). It has a kerb weight of 2189Kg (Auto), max tow 2000Kg and noseweight 2189Kg. We've had it a year and towed up steep hills and on exposed viaducts with crosswinds.
It behaves extremely well in all circumstances, having the torque for hills and power to accelerate and pull out on motorways to overtake lorries.
Stability is very good in all circumstances, last week on a viaduct near Chester we saw a Mondeo with a small single axle have a nasty swerve in the sidewind; ours twitched at the same time but it was no problem (the ATC on the caravan may also have played a part here).
Downsides: It's huge (uncomfortably wide for most parking spaces; some have been unreliable (ours had one known fault on delivery, fixed first time); parking brake is foot operated.
Positives: It's huge (really spacious inside); excellent value; equipment is brilliant (remote controlled sliding doors and DVD are great for kids); powerful and an excellent towcar.