To sway bar, or not?

[HwyStarJoe]

This is the first air bagged vehicle I've owned. '69 C10 Stepper.
2" drop spindles in front, mini C-notch rear.
Picture of rear (best pic I can get right now) at full drop.

I was thinking of installing front/rear sway bars. I haven't driven it much because I bought it when winter started. I don't know how much it leans or if it under steers yet. I drive it with the bags all the way down or very close to it.
Are they even necessary if I'm not auto-crossing or taking the exit ramps at 70? I don't see very much mention of sway bars on bagged suspensions doing a forum search.

Thanks