Looks like they are learning from the Great State of Taxes! Our state government has hired too many MBA's who sit around and think up new ways to tax us and call them "fees". Truck & car inspections & registrations(gone way up), trailer inspections, titles and registrations for kayaks with trolling motors, on and on.
I'll bet that after paying Port Isabel all that money, your truck & trailer aren't watched by any security folks at all.
I only ever go to Port Isabel to eat at Pelican Station.
I'm an Eighth Day Adventist. On the Eighth Day, God went fishing!