IRO Hack N Tap: Full Front Driveshaft?

I'm going to install the IRO Hack N Tap this weekend. Should I use the full drive shaft assembly with the double cardon joint in the front? I thought that you used double cardon joints when your driveshaft only has one bend, not two. I'm not planning on changing my pinion angle, so the pinion angle should stay parallel to the output shaft, making a double cardon joint inappropriate, right?

Yes, you need to use a double-cardon shaft with the SYE if you want to eliminate vibrations. The shaft should have a big bend at the transfer case and a small, 1-2 degree, downward drop in the rear, at rest, to accommodate the upward rotation of the rear axle, under acceleration.
https://www.jeepforum.com/forum/f11/official-sye-slip-yoke-eliminator-thread-all-read-426483/

Use an XJ Cherokee front driveshaft or something similar for the SYE driveshaft. Shim the rear axle to raise the pinion to the correct angle.

I used the same SYE and all I did is installed a front drive shaft from a xj of the same year so I have the same drive shaft front and rear . If I what to take a spare drive shaft when I go out all I need is one spare .