Yes, they trailer their boat w/full livewells to the weigh-in (90 min drive one-way for Guntersville). Post weigh-in, they're put into a release barge and trailered back to the lake.
I'm not a fan. I prefer places where the weigh-in is near the launch (Knoxville, New Orleans, Shreveport, etc)
I also wish they'd go to new places. Seems they're locked onto the same 5 or 6 locations and rotate amongst them. *yawn* With thousands of bodies of water to fish, it's a crime they don't go anywhere else.