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My motor did it when new. I forgot the pcv and breather when breaking it in. Not only ballooned valley, also leaking gaskets. I replaced the pan and added a breather. 6 years later the same motor is still running strong.

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Well - how you define "running strong" is way diff than mine. If you have enough pressure to "inflate" the VP gasket ..... your motor is a leaker- big-time. And piston-ring-seal is probably the most important factor of a good running internal combustion engine.

To the guy who had the stuck-floats and the oil was diluted with gas .... you probably hurt the rings badly. It is a well-known-fact that you can damage the rings with an excessively rich A/F mixture. What happens is that rich-mixture "washes" the oil off the rings and cyl walls. NOT good.

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I think you would be surprised how a good running engine WITHOUT a breather or PCV valve can pop a valley pan gasket.
Regular blowby running at highway speeds, I've seen it.

I'm not sure your motorhome could make it up to such speeds, being fiberglass and all.

Mind you- MY motorhome was a STEEL shell, and could SUSTAIN "highway speeds"....