Hi Michael i am in exactly the same boat - i have actually negotiated a free VW bike rack as part of my deal, but am not keen on the new version so having to consider an aftermarket tow bar as my Beach is now in the UK. I have copied an email conversation below which you may find helpful - he is quoting £250 for the basic tow hitch with electrics inc VAT
From me
Can you confirm the fitment will not affect the canbus wiring in the California.
I am only planning to use the tow hitch in combination with a Thule style bike rack - either the hitch mount or the hanging style.
If i were to attach a trailer how would the reversing sensors be affected.
Are there other things i need to know about - thanks
Supplier
The wiring I have quoted for is universal bypass which is all you would need for a cycle carrier or trailer , the reverse sensors will pick up a trailer when you put it in reverse but will not detect the towbar , we can fit a detachable towbar with universal wiring for £375.00 inc .
We can fit a dedicated vehicle specific wiring loom but this is much more expensive and no benefit unless you plan to tow a large caravan
Many thanks