My 3545 once ran a bamfords (JF) 2 drum mower for 10+hours.
now i use a leyland.
Fahr centipede needs no power at all. No problem.
Jones baler is a little heavy on hills, But pto power is no problem.
I reckon my 3545 would run A round baler (If I had one)
The only thing I ever had problems with is grass/hay wrapping around the propshaft untill it just broke off, Several times in fact:-x
P.S,I still cant find the number of the UJ joint.