I think this expanded rib increases weight approx. 30 kg does not affect motor load most. Cost does not change and so far, so choose whichever you want.
This type having an increased rib, but will increase the weight about 30㎏, I think that it does not affect the most motor load. Please select the more you like because it does not change a thing of the past cost.
This type of rib is large, about 30% of those with increased weight, and almost does not affect the motor load. Please choose the favorite cost more because you do not change this.