One of the main weeds in this area is kochia. It has a thick stem that a line won't cut through. I put one of these Stihl brush cutters on my trimmer and it stays on full time. You have to be careful with it but it cuts through kochia nicely and works well on all other weeds, too.

[Linked Image from stihlusa.com]

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.