I welded a ball on the box blade and back up to trailer and away we go
I just welded a plate and had a 2" ball on the back of my 4' box blade with my 2520 tractor. When I went up in size to a 5' box blade for the 3038 decided to get fancy and weld a receiver so I could change things if wanted. The reality is I rarely change the hitch out but the ability is there if I want to. That and a long receiver tube worked perfect to tie the three point hitch to the rear of the box blade structurally, so it was a natural fit.
But a ball hitch on the back for me lets me move trailers around that I otherwise might just be lazy and not unhook the blade. And I am extremely lazy because I even have a quick hitch, so hooking and unhooking is a breeze.