This may not be the best SE site for this question but I figured there had to be some engineering insight behind it- I've noticed in the western US tractor trailers have much longer hitches, like below, as compared to the east. http://www.capitaltruckbody.ca/images/PupTrailer2009V5009.jpg
It seems whenever I've been west of the Mississippi, most of the large general construction trailers have these extended hitches. The majority of the trailers I've seen up and down the east coast have shorter hitches, like this: https://dealer-cdn.com/media/offshore/IMG_9655.JPG
My apologies if the wording isn't correct, I'm not familiar with the terminology. The hitch length of western trailers seems to be consistently longer than necessary based on what I've seen on the east coast.
Secondary question that seems independent of trailer length as commented already, why do trapezoidal framed trailers with long tongues like this seem so prevalent in the western US:
I'm acutely aware of reason for their design but I'm just confused why I've never seen any like this on the east coast, even with plenty of mines/quarries around.