I use the hitch off the back of my Titan ballast box. When I bought the tractor used, it came with the style the OP listed pictures of, but I don't use that one. I'd definitely want some weight on the hitch since the 3pt has no control in the up direction. Either get the tongue weight wrong or just get some dynamic up loads bouncing around on uneven ground and handling of your tractor can get really interesting. Especially if the trailer outweighs the tractor. So, either a ballast box model or a heavy hitch style is much preferable. And if heavy hitch, I'd leave some weight on it when towing. Probably matters a little less with your 3-series vs. my 1-series, but still something to think about.