Trailer this baby behind your GT or ATV and ride the fence line. When you encounter a post, the mower deck swivels in and around the post. Once you've passed the post, it swings out and under the fence. Somebody was thinking. . . . .
Check out Knight9's post in <A target="_blank" HREF=http://www.tractorbynet.com/cgi-bin/compact/showflat.pl?Cat=&Board=off&Number=56107&page=&view=&sb=&o=&vc=1>this thread</A>. He posted a link to a picture that shows something similar.
2000 New Holland TC29D with 7308 FEL, and top & tilt. 1950 John Deere B. 1940 Farmall A.
Looks like a real handy implement! What brand is it and who sells it? What's the price? I've been contemplating trying to fabricate a 3pt hitch trimmer that runs off the PTO, but haven't gotten anywhere with it yet.
If you're into making your own, check out <A target="_blank" HREF=http://www.thestgeorgeco.com/catalogue/Farm_Forestry/Orchard/body_orchard.html>this web page</A>. About midway through the page they sell an optional swing arm side cutter mowing head similiar to the one on the above attachment.