I pulled mine to hold the plastic nuts so I could remove the flares to install sliders. When I saw how pristine the paint was behind them, vs the edge of the tub peppered with rock chips, I put them back so as to not create any more area subject to flying gravel.
Fwiw, the torque box was full of dirt even with the liners.
Fwiw, the torque box was full of dirt even with the liners.