from another happy 233S owner. Let us know if you have anything specific you want to know about the unit or mods.
Some of the easier and more common mods are:
Battery Disconnect (I think 2012 trailers come with one now)
Two 6-volt batteries - b/c we dry camp often
LED lighting - again the dry camping
Bypass for the water pump - for winterizing
Oxygenics shower head
Maxxair II vent covers
Install screws on rear bumper to hold caps in place
There's a bunch that people have done to the closets, thermostat, and more.