Same here at our brush pull, we have a 10,000lb class (and up)! They usually let me bump up into that class even though I out power them 2-1 or more. I just stay at 8500 but can keep my weight in the front.
Beat a 13,000 lb tow truck twice now and he quit coming back. LOL
I'd grab the weight if you not packing a pile of power, forward as possible and might need to re-think your final ratio.
I've seen twits show up with a half ton and a mini-bulk of grain in the back thinking they were going to pull the sled home and get 1/4 track out and the wheel's just quit turning! Which usually trigger's a bout of hysterical laughter from the crowd.