Having sued the Rockefeller real estate empire once, during my days as a paralegal, they will have the Devil’s own time collecting the judgment. There was such a maze of corporations and subsidiaries and shell companies, that we thought we sued everyone entity involved, but—SHAZAM!—we forgot one, the only one that had responsibility for the building in question apparently, and the court dismissed the PI complaint on that basis.
I doubt Trump’s personal liability is just wandering around mid-town like a babe in the woods, waiting to be scooped up and eaten by any psycho who gets a judgment against him. His old attorney Roy Cohn was a vicious SOB and a flaming homo, but also a brilliant lawyer. There are similar layers of corporate prestidigitation around all his assets as there were around the Rockefellers’ when my office sued them. No doubt.
President Trump was sued personally, though - not by way of any of his businesses.