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I don't know if it matters to you, but you might want to take a tape measure with you when you go see the trailer. Sometimes, these trailers may be labeled as an A3, but really be a frankenstein trailer: A2.5 where some parts are A2, others are A3.
Yes, the M101A3 has surge brakes.
Here's the technical manual for this class of trailers.
Checkout page 1-14 for the various dimensions.
http://test.steelsoldiers.com/upload/trailer/TM9-2330-202-14&P.pdf
http://www.steelsoldiers.com/trailer-tms/77618-tms-trailers.html