I worked in a place like that where nearly the entire night shift and many of the day shift(12hr) were traveling staff. Management was uninterested and uninvolved but this was back in the eighties when management stayed in the office. On a good day the regular staff were like acid and I survived six months. The way you described the management in your place, it's easy to see why they need temp. staff. Good luck and keep doing what you're doing. Your survivor skills are good.
I hope you get into a better place soon
R