Since I run the swanky european style trailer hitch on my VW passat it means the towbar ball is not interchangable. I am therefore leary about it wearing out too fast.
My 1 year old new to me seadoo sportster SCIC's karavan trailer coupler was rusted inside and abrasive to my trailer ball. So I bought a new reese coupler from my local Canadian Tire.
I installed it and there is a ~1 cm gap between the coupler top and the top of the trailer. IE the holes on the side of the coupler are a little higher than the stock one. Attached is a photo.
Thinking about this, it might be nice to have the coupler and trailer touching, but the towing forces appear to me it may not actually be adding much strength, but, I need the opinions of the expert tow'ers here. Thanks for your help