Originally Posted by Ray_Lawns
You can try putting water in your tires to help, past that I don't know. I run an Ecmrk HP with a 52 inch deck and it holds a slope like a goat . try filling the rear tires half full with water.
looks like he's in Canada... I wouldn't put water in up there due to freezing... a water/anti-freeze mix would work. If he has 26x12 rears that'll be close to 100lb additional per tire.