I wouldn't be able to use a 5 footer on the JD 2025R even though it has the hp (5 hp/ft) for it. The sides of the cutter would hang out past the rear wheels for about 6" on both sides. I'd be forever hanging it up on those front corners on the trails and other tight spots that I have to mow.
Had a 4 footer on the 18.5 hp JD 4010. Did fine with it but same issue to use a wider one, and it does not have the hp for a 5 footer.
Ralph