We ride almost exclusively in salt water, on San Diego Bay.
The boat and trailer are specifically outfitted for salt. Galvanized trailer then certain parts are epoxy or zinc painted and covered with urethane or something.
Numerous modifications to the boat. Almost everything is stainless including the through bolts for the exhaust manifolds. Joey at M2O in San Diego has modified wake boats for salt, for years as part of the Mission Bay Acquatic Center. Joey has a list that I'm sure he'd sell you for all the things they do to new 210s to defend them against corrosion.
With the hard tanks, they soder the wires then shrink wrap them so no part of the system inside the tank can corrode.
They take the dash apart and put corrosion guard on the electronics. There's grease in all the 12v. Every screw is stainless.
MBAC (where I bought the SANSE) explained the maintenance, but, basically, it only works they say if the boat is set up for salt. If not, it looks like you will have problems.
After riding, we soak the trailer and the boat, flush the motor, rinse the inside, clear out the bilge and then wipe everything down.
Once a week, we shower the motor in WD40. Once a month we strip the wax and redetail the boat. The boat also has grease fittings for the steering cable and the rudder so no or very little saltwater gets in there. The steering cable is apparently one of the first things to go otherwise. Once a month we pump new marine grease into those fittings.
Little things with the trailer: the trailer jack is galvanized; we replaced the lug nuts with grease packed closed head nuts.