I don't know what it's paying, but I don't see near as many three car haulers as I used to see running the roads.
Yesterday, while driving through San Antonio, I saw a late model F550 with a 6 car double decker trailer. First time I've seen a small truck pulling a rig like that.
Another thing to consider. Fuel is high, and the MPG in these new trucks is nowhere near what it was in the early 2k.
Here's my rig yesterday.

I left Fort Davis heading to Houston, I was bucking a head wind, and grossing a hair over 33k
Here's a shot of my MPG

Once I made it to flat country, I bumped up to the 9mpg range
In my 03 5.9 cummins, I would have expected to see closer to 10mpg.
I think I'd take a long hard look at what your per mile cost will be in a $45-65k truck, burning $3.69 gal diesel, rolling on tires that cost dang near $200.00 each, before I dove back in to hauling cars.