2dof vs 3dof parts needed for traction loss mod

[Nigelmainsail]

Hi all

I was wondering what are the advantages of of 3dof over 2dof? In terms of feel.

Also is xsim capable of traction loss if I add it to my design?

What parts will I need to complete a 2dof with traction loss? Poss 3dof.

& how much will they cost?

Thanks