Driving impression: JF-Stoll GXT12000/GD3205 F mower combination While most of Europe’s mower makers have been heading down the ‘butterfly’ route to maximising output, Danish firm JF-Stoll has seemed noticeably reluctant to follow suit, preferring to stick with the conventional approach of pumping out its solo trailed machines wider – and even wider. That changes in 2008 when UK farmers are likely to get their first glimpse of JF’s monster GXT