Our C came with factory airbags but I noticed it leaned to the left slightly. I checked them both with soapy water and found them to be leaking. Tightened them and now no trouble other than the eventual leakage with time. I check them every trip and they always maintain around 40Lbs. However the left side of the C does lean and inch or so to the left but the majority of the C's weight (slide outs) is on the left side and it's ten years old so I compensate by more air in the left side bag.