Actually, you should be OK with the MoJack EZLift. That 300lb capacity is kinda like tongue weight on a trailer hitch. My dealer told me that since most of the weight is in the rear of the ZTR, lifting the front probably wouldn't exceed 200lbs. My Gravely Pro Turn 152 weighs in at 1,051lbs and the Mojack EZLift works just fine. How much does your Exmark weigh?