I am not a GM guy to help on this, but seems to me you should go ahead and hitch up, connect the wiring harness and try to move the units with the brakes applied thru the brake pedal. This won't hurt anything and the truck itself will stop the trailer if the brakes aren't working.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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