I’m new to VW but am pleased to see that waving at each other is something Transporter drivers do as well; I’m a soon to be T6 driver but I currently drive a Defender and waving at fellow Land Rover drivers is something I’ve become accustomed to doing (I look a bit of a plonker when I forget which car I’m driving and wave at Land Rovers from my wife’s X3 though!)
On a recent Land Rover forum thread, one of the moderators discussed the number of Transporter drivers that wave at him in his Defender - the resultant discussions showed that one of the reasons was quite a few members run (or have run) both Transporters and/or Landys.
Think I’ll start waving at Transporters from my Defender from now on as well as Land Rovers to get some practice in so, if you see someone in a Defender enthusiastically waiving at you, they may not have gone mad, it could be me!!