Shock Absorbers

Well I "Dove In" this weekend and started my trailer. What's the Pro's & Con's on 'Shock Absorbers on TD's.
I don't see them on any of the build pages, so are they needed to keep the TD's from bouncing all over the place or are they just not necesary.
Thanks,
Bob

I don't see them on any of the build pages, so are they needed to keep the TD's from bouncing all over the place or are they just not necesary.
Thanks,
Bob
