Thank you. Makes sense to get 240V out to the HVAC unit with the white wire serving as a hot leg instead of a neutral. To check my understanding, if a neutral was desire/required to the HVAC disconnect (ignoring the rest of the mess going on for the moment), it would require a 4 wire pull, likely color coded black, red (both hot legs) white neutral and a green or bare ground?
No ground rod was observed around the trailer. Additionally the line going from the disconnect to the trailer terminated in a female 240V outlet that was on the ground with a 240V male end from the trailer. Total length of the two cables combined was likely beyond 100 feet.
Rob’s answer is correct. I was asking about the rod thinking that they may have added a disconnect at the trailer and that they were using the 2005 NEC, allowing a three wire connection. Note: the set up is not allowed.