Crusader,
Towed with a Laguna for 3 years now and have suffered with some of the issues mentioned above. Towing weights issue is a joke. Capability alledgedly drops by around 400kg as soon as you put more than one person in it ! Reliablity has been a nightmare, especially in the last year. Blown turbo's, broken electric windows, detaching brake callipers - you name it, I've had it. Thank god it is a company car. To add insult to injury, dealers give very poor service. On the plus side the engine (when it does operate!) is very flexible and pulls with ease. On motorway/autoroute can even get into 6th gear when towing.
However, I've just traded in the Wife's car for a 150bhp Vectra SRi and intend towing with that from now on. First impressions are that in all aspects it leaves the Laguna looking like a poor relation.