It's true...if given a choice mechanics prefer a straight beam/leaf spring suspension. All you have to do is look underneath a rig with TAK-4 and a straight axle to see what they mean. TAK-4 greatly restricts access to the bottom of the engine and all it's pieces, parts, hoses, etc. My agency runs nothing but Quantums and they all have straight axles. Mothership Pierce was quite surprised to hear us not choose their torsion bar wonder and go with an old-school setup but a happy mechanic is a happy life.