Have sold a few 2015 hst, with the Befco t-30-50, 50" with offset capability and it works well. As far as 60" goes, i think its a little large in my opinion, but that also depends on what you are tilling. Virgin ground, hard clay or light humus type soil in a garden.
If you are using it in a garden with nice soil not a lot of rock, should work ok.
- If you have soil like in the Troy built tiller comercials where the guy can till with 1 hand( not around here) you could probaly go bigger. /forums/images/graemlins/grin.gif