Fair enough mate, thanks for confirming. You've got the same issue I have. When I first had the towbar fitted (Hayman Reece number) the hitch sat 2 1/2" lower than where it now sits which is about the same height as yours. Stock as a rock I couldn't back into my driveway which is a 9degree incline so I got pissed and had it cut and rewelded higher and thus voiding m useless warranty on the towbar.
If you don't mind me hijacking your thread a bit I'll post up a couple of pictures of my drawer setup. I contemplated building them out of 2mm gal sheet but in the end couldn't spare the time so had a set made to suit and installed.