I installed the factory hitch/wiring as-recommended by this forum: very heavy-duty, no worries from now on. Wish my ball/carrier didn't bounce around so much inside the 2" square opening with light trailer loads on a light trailer.

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'06 4.8is Imola Red
'91 911 Turbo
'86 928S Turbo
'82 928 Turbo Race car
'80 Porsche/Glastron Carlson CVX 20 Intimidator,
'74 911 RSR Tube-frame clone Race car