Not the VW version but Land Rovers. I played with it on our acquisition of a vehicle packaged with trailer assist, 6 years back. Here it required a three big dot triangled target to be placed on the caravan's front, and inputting some geometry particulars of the set up, plus a bit of manoeuvring to enable "it to learn".
We did not accept living with this big target as a styling feature of our van so I made up a self adhesive removable one. Stopping, finding and fixing that, plus getting out and recovering it [and remembering] before we could move on was a hassle too far, that I soon gave up on. Add to that the target ideally needed to be mounted quite high, lapping over the front window. On a horse box or industrial trailer where this target could be acceptable as a fixed feature, would of course remove that aspect.
Functionally, yes it gave useful guidance, but then I have no great challenge reversing trailers, nor in reality do I often need to, with specifically our caravan.
As has already been said the layout of many site pitches all but dictate the van's placement solo, either it physically can't be achieved coupled, or only at the expense of clipping over the dividing grass, damaging the site when soft. Plus, to that, a mover is absolutely essential at home as the lane is only just as wide as the van is long, therefore that mover is available anywhere.
The "assist" was for me little more that of play value as a technically intriguing toy, that with the target's hassle then became short lived. Its real use in the context of our caravanning, is decidedly limited.
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