I have a MoJack XT for X-One and it works great...........without it, there is no way to really get a good under deck cleaning......
I raise it up all the way, usually the rear, small wheels are resting FIRMLY on the concrete in my garage.
With the SD, you shouldn't need to purchase the XT, the standard MoJack should work for you...their website has a chart with weights on it. Just take your mowers weight and multiply it by 30%, that will give you the MoJack that you need.
One piece of advise on the MoJack.....do not use an impact wrench to raise and lower it....it's not designed for an impact wrench....it strips it out.......LOL