I parked the van on the Eurotunnel. I got a call within seconds of the train moving. It's a tracker fitted by VanBitz. Backed by MetaTrak.We have a Sargent on current M/H ,they phoned up and said your m/H been has on the move on a certain date , I think it was 5 days after the movement !! Yes I said it was on the move without me in it when it was shook about on the Dover to Calais ferry !? Wouldn't buy one of theirs.