Kubota B2710, IH TD6-62 dozer with Drott 4n1 bucket loader
I also answered this in the Kubota Owning and Operating forum.
The L8312 draft control option is what is used on the L30 series so I guess that means the L3010 too. It retails for about $400 and is a dealer installed option so you could do it yourself. I have no idea how it connects or how it works.
You should contact your local Kubota dealer for additional information.