High side drivers need their gate issolated, or a voltage up converter stage because voltages higher than the supply are needed to turn the Mosfet on. Pulse transformers are useful if the switching rate is decent or you have a real low gate capacitance, for low speed switching you can use photo voltaic issolators. That's a lot of current to be switching though, you're going to want more than one FET and good heatsinks as well. Driving Mosfets at that power level is troublesome though because you need to keep the FET out of it's linear range, or it'll meltdown.