High Power, Low Freq MOSFET H Bridge Design
For this device, you won't get the heat from the device and you'll need a heatsink and TO-220+ package: -



If you drive the gate with at least 10V, the lower graph tells you the on-resistance is about 5 milli-ohms typically. At 50A this means a volt drop of 0.25V and to avoid going into the unsafe area of the graph (the part called limited by Rds(on)), your max current is about 20A.

Go for a bigger transistor not something that is surface mounted