whether it be refrigerators, or stoves, or the heater or even the electrical, there is always a risk even in your home, but we cant let these things prevent us from doing what we enjoy.. can a refrigerator malfunction? sure it can, but I have used them over the years in 5 different RV's myself so far and never a problem, but if you look hard enough you will find where pretty much every component on an rv has malfunctioned at some point in time..
we simply have to prepare the best we can and deal with these issues when they arise. always do pre-trip inspections/ tests before heading out on trips whether it be a short one within a 100 miles or the cross country trips.. also keep up on the maintenance.. you can easily test propane for leaks also easily enough on your own with soapy water or with an electronic tester.
We also travel typically with good friends,I trust them to have a key to our rig, and in the event we are away they would be able to quickly gain access if our pets were locked inside and needed to get them out quickly... hopefully they would be able to respond quickly if anything ever happened or vice-versa if they happened to leave for a while and we were still in the cg.. they are also well acquainted with our pets so that they would easily go to them in event of a fire etc.