There's one issue with RV bathrooms - every so often you're going to need to dump the black water tank.

An RV is fine for hurricane evacuation as long as you don't wait until the last second to get fuel. An RV means you have a roof, a bed, and a hot meal even if the hotels are full inland. Hurricanes give a lot of warning these days so I don't think this is a bad strategy.

RVs are fragile compared to any building. No way do you ever "ride out" any weather in one. If it survives outside it's useful to have afterward, but you never shelter in one.

Finally, almost all RVs have serious weight problems. When my family was shopping I found several 40' RVs that went over the chassis weight limit by merely filling the fuel & water tanks & having a fat driver. Most RVs can carry a few hundred lbs of cargo total, not per person. Diesels are worse because of the weight of the engine.