I still haven't found any manufacturing faults but one or two design faults are rather obvious.
The key pad for the alarm is nearly on the floor and the outside light switch is inside the caravan so when you return on a dark night you can't see the key pad before you've switched on the outside light which is after you've opened the door and possibly set the alarm off.
I've remedied this situation by removing the alarm(available for sale!!) and replacing it with a key fob operated one which puts the outside light on when arm/disarmed.
There are no fuses in the caravan road lights which I find odd as most previous vans have had the 12N lead come in at the front with a bank of fuses. This means that a fault on the caravan could fuse the towcar lights.
The water pump has also been modified so that a submersible pump now fills the tank via the switch from the useless gas bottle light(now disconnected!).
Otherwise the van is really great.