Trump has never personally filed bankruptcy. (Iirc) A few of his casinos did, when the existing laws made more sense to do so than not.
Oh my how tactful you are. What a pathetic dodge. His companies did go bankrupt. And the bankers in the US wouldn't lend him any more money for they all thought him a BAD risk. How did he rebound? The US bankers thought it was in their best interest to prop him up instead of him totally financially collapsing. And then there was the foreign money that propped him up. Which leads to the who and why.
Dig a little deeper through the BS and you begin to see the BEAR.
There was no dodge. From a dollar and cents perspective it made more sense to use the existing laws as the were written, to the best advantage. Many other businesses did the same thing at the same time for the same reasons. Picking one company and yelling "ah ha! Gotcha now!!" Is flat out stupid. Businesses incorporate, go LLC, and other terms to isolate and insulate themselves personally from the business like a firewall, for much the same reasons. If the business goes down, you don't lose your house and car as well. There is nothing underhanded about it.
