Paul Franklin wrote:

There are wheeled string trimmers. The DR Trimmer is probably the
best of that lot. www.drtrimmer.com

Great when you have lots of trimming, very heavy trimming, slopes,
around ponds, etc. With their chainsaw style blade accessory it will
cut through 3-4" dia saplings.

Would it actually be possible to "mow" with such a
device if the yard is small?