IIRC, the Ram axle center to cab is only 37-38"s on your model, vrs the GM 42-43"s. To turn 90 degrees, obviously a slider is needed. Be aware, with only 6.3' of bed length, and too much slide you could contact the tailgate, moving pinbox back.
I never could understand a 90 degree backing, which to me is just twisting trailer side ways, not backing.
Jerry