I had heard this and was aware when I bought my 2018 Swift Conqueror 580. At the dealer(Grantham Caravans) the lights were tested and OK but if they weren’t then they would have fitted the VLM6 there and then with no mention of cost. It is fitted with genuine Volvo electrics.
My son bought a 2014 Range Rover and I was not sure if the lights would be OK but I turned out that they were.
I did contact Sargent direct and from what they told me they were quite happy to supply the VLM6 and was told that it came with complete instructions for what was an easy fit.
It may be that the problem is your electrics not the caravan!
As you say go back to your dealer and try and get them to fit it for free.
__________________
XC60 2013 D5 215 SE Lux Nav geartronic
|