Regular sheet vinyl flooring shrinks in cold temps and the colder it gets, the more it shrinks. That's a fundamental property and can't be avoided except for installing another type of material or maybe providing a little heat. It is more likely to crack at higher stress points like floor vents where there are sharp corners. It's not an uncommon occurrence over winter storage and you can find reports of it around this time every year.
One thing is for certain, the manufacturers will be using the cheapest of the cheap flooring material. It just needs to *look* good on display at a dealer or show.
A 100% free-floating laminate plank floor is a good solution as westend talks about above. It might be possible to cut some patch pieces out from below dinette seating, in the underbed storage, or under the shower/tub and then use seam sealer to make a permanent and almost invisible repair. But it could happen again. I installed laminate flooring in a previous TT and it made it look like a high-end unit. Recommended! :)