It's just a piece of poly propolyne with a monkey fist and a loop on one end, your local marine supply store can make you this for less than what a company like Bubba Rope will sell it to you. And I see no benefit at all other than ease of use since you still have a shackle on your hitch. What is the design factor of that sling though? You mention it is rated for 30,000lbs, is that the minimum breaking strength or safe working load limit? Crosby alloyed shackles have a design factor of 5:1 and a 3/4" bow shackle has a safe WLL of 7 tons. Multiple that by 5 and minimum breaking strength is over 70,000lbs.
He's an angel dressed in oilskins; he's a saint in the "Sou'wester,"
He's a pluck as they come, or ever can;
He's a hero born and bred, but it hasn't swelled his head,
For he's just the U.S. Government's hired man.