You don't need wheels. They will just add extra weight. The beauty of a trimmer is that you can use it in the air to remove overhead overgrowth too.
Totally agree on that.sick4surf said:Get a shoulder strap, use the metal sling blades and get busy.
If you've got a long trail in a meadow, use a self propelled DR Mower or brush cutter, you can rent them at any tool rental place.