SPUD BARGE MOORING RESULTS NOT CONVERGING

I am trying to perform spud barge mooring, where two spuds are used to moor in x and y direction..vessel can move in z direction freely.

I am trying to use rod element for two spuds..but moses allows only one rod element to be defined and ignores another rod..

Another option is to model spuds as piles and connect these piles with barge with spring elements....where spring will have stiffness in x and y direction and z direction stiffness will be zero.

Please guide me which is the best way to do it..as in first option results are not converging and second rod element is getting ignored.

Any help will be highly appreciated.