Have JD 28 hp 4210 E-hydro (pto 22hp)--I have been trying to decide between First Choice RTO4 60 inch and RTO4 48 inch (Gear box is permanently offset). The 60 inch would cover my tracks but I am concerned that the 22hp is not enough. The 60 inch is $100 more than the 48 inch. I can live with...