Don’t forget kingpins and truck hardware which get hit especially hard with brine, and also the obvious things like motor bearings.
If you do this it helps as well for keeping the motor bearings oiled.
As you said, hosing the skate off, even in the motors, while running the throttle a bit, will help a LOT. Make sure it’s immediately after the ride.
I would also make sure you’ve used butyl tape on your enclosure or another sufficiently water resistant solution.