I have had fuel spill from that tank only once, chalked it up to being my fault. We were backing into a pretty onerous spot one evening, backed down a berm with the trailer listing heavily towards the filling side. Once we abruptly leveled out, the wife said that the trailer was leaking and smelled of gas. I checked it later on it had dried up and has not happened since. I had a half tank of fuel at the time.
TV: 2015 F-350 DRW, CC, 4x4, with 14k GVWR package, 98 gallon TransferFlow Aux Tank, Timbren Shocks
TH: 2014 Voltage 3950, Sailun S637 all around