A fine car the 130 - my son has the estate and it is a most impressive vehicle.
However he has had a few electrical problems due to muck blocking drainage vents behind the battery and causing water to build up in the battery tray and enter the passenger compartment.
We only found this to be the problem after searching various VW forums all of which were incredibly helpful.
Trouble is the water managed to get into the ECU which is housed in a plastic box under the carpet in the passenger footwell.
We think we were lucky and managed to extract it and dry it out - but it is now throwing up a few niggly faults which can be a pain to clear.
I post this just to warn people that if you have a Passat take the battery out and give the bay and surrounding area a good clean.
Any sign of damp in the footwell get it sorted!
Darce
You might want to check the 10mm bolts are tight on the pollen filter housing and that there is no muck around it also.
It is on the left hand side of the car, under the bonnet,below the windscreen.
I had water in the passenger footwell which was coming through the housing. It also effected the alarm.
I also agree with your comments on the battery tray.
As for the 130 estate as a tow car, I've just replaced mine with a Nissan X Trail(second hand). It was struggling a bit on hills and it blew a high pressure turbo pipe on our way back from Cornwall.
I much prefer the X Trail for stability and it cruises up hills with comparative ease.
I was at a 83% match with the VW, in case you were wondering and I'm now on 89%.