I have a Maverick X3 with the pivoting rack. Looking to add a storage box on top of the Pivoting Rack - anyone have any experience with this?? I'm looking at the biggest box - 32gal; just worried its too heavy or its so high up once installed that getting in and out of it is a challenge (I have a hitch so maybe could stand on it??). Will the pivoting rack swing up when the box is loaded so I can get into the lower storage box??