Australian Greens leader Bob Brown said the convoy seemed "like a bit of a flop" adding for every truck that had turned up another five had stayed away.
"It hasn't blockaded anything," he told reporters.
"But it has got the moaners' brigade in town to moan about everything in general and nothing in particular."
Senator Brown said the low numbers were a reflection on Mr Abbott.
"This is Tony Abbott's flop, but they're being led on by him because he wants an election. That's why the truckies are in town."
The protesters did not have any common thread of complaint, Senator Brown said.
"It's just a general smorgasbord of whingers."