Recreational Vehicle Lpg Tank Valve/gauge problems of the 2012 Nissan Altima

I was driving my car down the road heading to get something to eat. It was a Sunday night, it just started misting rain. I drove on my usual curvy 2 lane paved highway and then proceed onto my usual 4 lane paved highway to mcdonald's where I got food inside and then upon leaving decided to go through drive through for another item. I left and headed approximately 3 miles back on the same road I traveled to town on. As I was on the 2 lane ithe all of a sudden appeared to be raining heavier and I could tell by the rain crossing over my headlights. Something different than normal caught my eye, it looked like orange rain, I assumed just the appearance from one of the bulbs. Unsure though, I continued driving but scooted to the edge of my seat and set up tall to getta better look, at that time I seen flames. The car was on fire, I couldn't pull off side of road as it has no ditches just ravines so I slowed down and tried unlocking my door to open it wouldn't and my window wouldn't roll down, terrified I proceeded to call 911 and inform them my car was on fire and I was in it driving down the road and was hoping to get to next road I knew I could pull off. The entire time never did anything warning lights or gauges come on nor did the temperature rise. I finally was able to exist the car fully engulfed in flames. The police department and fire department finally arrived. Theyou got it put out but it was complete loss. I have no idea as to why this fire happened I took well care of my car, maintaining it regularly as recommended and always cautiously driving it. I have another Nissan Altima that's still running strong with 300,000. 00 miles on it, so this should show I care for my vehicles above what's recommended.