A few times what's worked for me is to set the tractor brake, pull the kingpin, set the trailer brake, lower the landing gear, unhook the airlines, then dropping the trailer. Yes it sounds crazy but it sure helps if the kingpin is in a bind and you have problems unhooking.
A few times what's worked for me is to set the tractor brake, pull the kingpin, set the trailer brake, lower the landing gear, unhook the airlines, then dropping the trailer. Yes it sounds crazy but it sure helps if the kingpin is in a bind and you have problems unhooking.