I actually somehow managed to do this solo. I just duplicated the carcass and when I had one on the floor and one on my horse, I just picked up the one on the floor and had my horse follow me to the butcher. It allowed me to sell it infinite times, but I did need to hover over the different...
Originally had the cheap maze bank tower with fully upgraded coke business, did not work at all
Bought the 4m ceo maze bank office glitch began working immediately so I guess the 4m maze bank office is mandatory
Edit: ps4, 1st character has most expensive ceo office w/ clubhouse. 2nd character...