[Turnip Truck]

I pulled the below quote straight from the Offroad Design web page.

Many trucks (particularly the straight axle GM and Dodge trucks) suffer from some serious steering problems, one of the biggest is due to poor geometry. The factory steering will fail to steer the truck when you're in twisted offroad situations. In fact, there are many times when the steering box is all the way to lock and the tires are pointed straight!

Our solution to this is a "crossover steering" system where the draglink runs side to side instead of front to back. This dramatically improves the steering geometry and makes turning to the axle stops possible under all conditions.

Solid axle conversions virtually always need crossover steering as well.

I am going with crossover for the reasons noted above, and because my truck already has a 2wd steering box in place (which is required for crossover).