If the water splashes out of the p-traps in the sinks while you're trucking down the road
Man, what are you driving over that would make water jump all the way out of your plumbing and clear the sink countertop?!?!?
There is no way any water should come out of your p-traps during normal operation of your RV, except, possibly, from evaporation if the RV has sat for a while. And even if it
did somehow splash out of the p-trap, it would end up in your sink basin or shower basin and then drain right back down into the p-trap.
If the water is completely clearing the p-trap
and your sink/tub basin, more than likely your RV is tipped over on its side and you have bigger problems. :)
Steve
