Looks like you have modified the coupling to a hydraulic brake from the original Pintal hitch? Are you carrying heavy loads in the trailer and need hydraulic brakes? I thought the no5 was only rated to 750kg's all up anyway?
If you have a swing away spare wheel carrier can't you just swing the wheel away and hitch the trailer or does the spare fowl the top of the hitch when you swing it back to close? Maybe you can raise the height of the spare mount on the carrier 50mm (I am sure you have probably considered this anyway). Might be the best way to go as increasing the length of the receiver may cause other complications if it is not engineered correctly and you are intending to carry heavy loads.
Good luck.
Regards Warrick.
"Any intelligent fool can make things bigger and more complex....It takes a touch of genius and a lot of courage to move in the opposite direction."
Albert Einstein.
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