Living in a van or RV is not much of a good place to raise a dog without experience. If you do want one any shelter will probably have a senior dog that will need a home. Their behavior is already known and you don't have to worry about a puppy phase with them chewing up everything or the...
DITTO. That's all I have used for years. And you don't have to worry about drying them and adding a bunch of moisture to the living space. In fact you don't want them to dry. Just wring them out and put them back in the tube or a ziplock.
They may appear to be small leaks. But the water will find its way down between the walls where you can't see it. Next thing you know...You have to rip out and repair a whole section of rotten moldy material. I highly suggest you repair it properly.