Very sorry to hear about something like this. Unfortunately, this is something that can cause a total loss.
RV horror storyThere is no time to lose, *if* there is any time to salvage this.
I'd use a hair dryer to try and dry it up where cabinetry sits directly on the floor.
There can be water inside cabinets that you can't see or access. If there are any inaccessible cavities, pull the luan plywood up to gain access. It's only held in place by little staples. Under a bathroom vanity cabinet is an example. If there is a blank panel at the bottom of a cabinet (pantry for example), push it inwards to gain access.
There may be an access cover to the shower/tub p-trap which should be removed.
Check the pass-through for water too.
Take plywood or OSB covers off dinette seating to get to chack for water.
If there is an enclosed underbelly, I would pull it out and clean up underneath. If there is insulation in there, it could have gotten wet and you don't want water trapped and sitting in there.
Turn the furnace on and get it heated up. Go to a hardware store and get a big portable fan or two and drive the moisture out.
Those alarms are a nice idea but won't help if nobody is there. There was a post here recently where the CG supply went down and the RV owners forgot that they had left a faucet on. They went out for a while and during that time, the CG water system got turned back on. I installed a master shut-off valve under our kitchen sink for times when we go out.