Just remember that my 2 wheel dolly is a home made heavy duty unit and not one of the cheaper versions that may not support the weight of a 5 or 6 hundred pound mower.
There are some considerations to take into account. Don't just use any little rinky dink two wheel dolly, it needs to be heavy duty. Also I have a U shaped steel that hooks into the frame to keep the mower from sliding off. Finally the angle of the mower when lifted will be on the back side of the dolly wheels to apply the weight. It should be fairly hard to lift the dolly to lower the mower back down. Must be safe to avoid an accident. Thanks for your positive comment.
Each zero turn is built differently and you would have to design the lift to accommodate that particular mower. The lift extension is fastened to the lip and the axle of the 2 wheel dolly. Also you have to provision the end of the lift so it will lock into the mower to prevent the mower from slipping off.