I had a situation once where we pushed a buddies broken quad into my toy hauler. His son was in the trailer 'playing' and turned the gas on. The float was stuck, as the quad had tumbled. This allowed gas to leak out the vent. About a gallon had leaked on the floor before it was noticed. I tried cleaning it up, but the trailer smelled like gas for a couple of years.
I recently bought a new toy hauler and checked out a lot of units. I was specifically looking for a closed off garage. However, I needed 12' of length to haul all four of our atvs. One thing to look for is that several of the trailers with garages had short doors between the garage and kitchen. It think it was a Jayco where I'd hit my head. Kind of stupid.
There was one trailer that had a 2nd bathroom in the garage. This is great for having the kids to stay out of your bathroom....