deep do-do

by Ben There
(Wa.State)

I drove Truck reefer/tanker/flatbed&lowboy years ago,but there is one thing I could never figure out.Please don't take it personal , because I'm speaking in general and to no one in perticular but , why is it when you get arround a loading dock,or truck stop or anywhere drivers gather the do-do is so deep? Now if you've been driving long you know exactly what I mean.Why Truckers have altered the field of Physics by bringing depth to a new dimension!