From a real quick look, it looks like its ONLY that very bottom 6 volt battery Id consider a Golf Cart True Deep Cycle but you would need 2 in series for 12 volts. When I see terms like cranking or starting I still view such as combination quasi deep cycle RV/Marine use which just arent the same a pure deep cycle batteries like used on mules and golf carts etc.
HOWEVER it also depends on how one uses the Winch. The RV/Marine quasi deep cycle is able to deliver a high short burst of current (maybe winch the tractor up the ramp, the hardest pull requiring most amps) plus still has some long term deep discharge capacity. But if theres gonna be a bunch of winch use over a long time before the battery can be recharged THEN ID OPT FOR A TRUE DEEP CYCLE.
IN HINDSIGHT I may back pedal just a bit away from my first post. There are times where a deep cycle is best (lots of use over long period before re charge) but maybe for a one time hard heavy pull and youre done for a good while then a quasi deep cycle RV/Marine (with that high amp short term capacity) may be okay??????