I think if you have a 60" deck and try to mow half on the road shoulder and half into the ditch in float mode, you're going to scalp if you float the deck. If you offset it so it is, say, 18" to the right, and you keep the FEL out of float so as not to put sideways torque on the thing, you can mow 18" to the right, the deck wheels won't be touching the ground, the grass in the ditch will be at the same height as the grass on the shoulder even though the ground may drop off into the ditch.... is that what you want to do?
Also, you're going to be putting some left/right (roll for you pilots) twisting torque on the FEL arms if the mower deck is not centered. I don't think its going to take much to bend or twist the FEL arms in that direction. Just be aware of that.
