When a Box Blade Grader is properly filled it can weigh a "shit ton". Sometimes to get more traction, I'll fill up my front bucket but its a 2 edged sword...too much weight and it can bog down the tractor. Some front end weights can solve that, I just choose to use the bucket and not pay for the weights!
A 6' Box Grader would have been way too much weight to properly do your grading/smoothing etc. Regardless, enjoy the tractor, it is a helluva tool!
(PS, I'm still negotiating on the Phoenix gig that I told you about so I'll let you know if anything happens!)