Ernst twist lock rails all the way.
http://www.ernstmfg.com/
I work on diesel gensets on mountaintops, so my beater road box is pretty well destroyed running up fire and logging roads every day, but never had a socket come off a rail!
It's a mix of Ernst on the 3/8" impacts, Craftsman rails for the 1/2", Gearwrench on some sets, and some metal rails cut to whatever length I need. 1/4" sets are in cases.