It's a full wire-in job on the Polo.
This means the trims across the back, and down the right-hand side of the car have to come off to feed the wiring harness through.
I've only done one, but from memory, it wasn't too bad to do. There was one annoyance, which doing the wiring under the dash.
The cut-out for the bumper is undernieth, so if you took the tounge out, you wouldn't be able to tell if the towbar was there at all, unless you had a look under the car.
'07 Transporter 1.9 TDI
'01 Beetle 2.0
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