any chance you can post a screen shot of the assy?
Hard to tell what the situation is...you could just use the spring connector or the link connector, put in a beam or truss for the cable elements. If the cables are wire rope it is hard to imagine that their behaviour would be very non-linear.
I have simulated wire ropes in two ways:
1) Simulate the cable/wire rope with a thin member, like a pipe. Assign the pipe a custom material which has near zero density. The zero density is necessary if you are using gravity loads in order to prevent the simulated cable from experiencing large deflections and stresses due to self-weight.
2) Simulate the cable/wire rope with a "tension only spring" connector. In order to do this, you have to create a shell or solid part on either end of the spring and bond it to your beam elements, because Simulation doesn't allow you to connect springs to beam elements or restraints. You can set the spring constant to be the same as the proposed wire rope size.
I've never been able to get "truss" elements to work for me. Of the methods above, I 1 is quicker and 2 is more accurate. If you just want reaction forces, 1 would probably do.