Ditto on the Reverso gear pump and Larry’s permanently attached oil pan hose. Our oil pan hoses, with shut off valves at the oil pans, lead to hydraulic fittings, one of which can be seen at the very bottom, center, of the photo. The hose to the Reverso can be plugged into either engine’s oil drain line via these fittings.
The discharged oil goes into a five-gallon pail and two one-gallon jugs and gets recycled. I use a gallon-sized zip-lock bag around each oil filter to catch the inevitable gush when they’re loosened. Finally, I keep a big supply of engine diapers nearby. Stuff happens.