I removed the old 1 7/8" coupler with intent of replacing it with a 2" ball coupler with a center jack mount. AI search suggested that Scamp trailers have a 50 degree A frame which is standard in US for A frame trailers, so I removed it and tried to fit a 50 degree coupler I got from Harbor Freight.

Wrong!!! My Scamp A frame measured a "proprietory" 45 degree angle! Has anyone faced the same problem. Is there a source for a 45 degree coupler with a jack mount hole? Thank you all for help!