Installing anything that is not designed by a qualified person or OEM spec that meets or exceeds DOT laws, and using that on public roads to tow any load, is usually a full recipe for disaster and if or when it happens, your insurance company usually will throw you to the wolves with no coverage whatsoever and deem you at fault regardless.
unless your an engineer for VW or a company permitted to do so by DOT, then you are not a qualified person to do so.
that being said, take it to a professional and have documentation of the install. Or do whatever you want.... you have been informed. I highly suggest you read up on your insurance policy.
Also modifying a safety feature will also land you in hot water if it ends up being in a collision.