We lock the doors because we have trust issues. Had a little kid open up door one time while we were inside watching tv. He lost his mommy and we could of lost our dogs. Plus when was the last time you seen a RV at a campground you have been to go up in flames. Sure we all seen a picture from who knows where... We have been camping over 20 years and never see this before. But have seen a few houses go up in flames with more dogs than you can shake a stick at inside and people don't leave then unlocked. I think you would need a seat belt for your pets more than worrying about fires and bet you don't use any.... we don't...
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