What height does bumps steer become an issue??

[smoknbarrels]

I am bagging my truck at the moment, but I wanna know how low I car drive it, until bump steer becomes a problem (or start happening?).

I am setting it up so that the control arm will touch the ground when deflated, so i figure I'll drive the truck with the front crossmember about 4 inch off the ground, will I have bump steer problems with that setup?

arms, crossmember, and mounting locations are all still stock. but I do have drop spindles installed.