I didn’t like pouring the fluid out of the t-case all over the skid.
So I got a hose barb-to-pipe thread fitting, stuck a length of hose on it, and use it to drain my t-case.
I connect the drain line first, to minimize what does spill out. Then pull the fill plug to let it drain quickly.
Ya still gotta mop up some fluid, but not a lot if you get the drain line screwed in quickly.