Advice on a good quality hitch that will work with my setup.

With the short bed I would also recommend a slider, preferably an auto slider. Yeah, it is a little pricey. But compared to the cost of the truck and 5er, not so much so. And the slider will still be in the truck if you trade for a new 5er. And can be moved if you trade for a new truck.
As the old saying goes, it is better to have it and not need it than need it and not have it. A good friend knocked out his back window on his short bed with no slider on a tight back in turn into his RV site.