The Albright solenoids found on some Superwinch winches are pretty robust. Miles better than the Warn solenoids. Without looking, I'm not sure what the X9 uses. But I know the EP9 uses the Albright solenoid and it can be remote mounted as well.
You should look at the EP9 over the X9, IMO. Amazon.com had a good deal on them, too, not long ago.
EDIT: EP9, $550 shipped from Amazon http://www.amazon.com/Superwinch-090...3201396&sr=8-1