1. The refer had no pilot light. It had an Auto ignition system. That means the refer could be lit at anytime if calling for cold OR it could have cycled ON when they were filling
2. PROPER fill you ALWAYS turn the LP tank OFF. That means the LP filler and U Haul will be liable for all damages, not the RV family.
3. By ALWAYS turning the tank OFF prior to filling, ANY LP appliance that may be running will deplete the existing LP in the lines in about 30 seconds. Even if NO appliance was running and the tank OFF, and a Appliance came ON, it would deplete the LP in the lines in that same 30 seconds
4. The Filler (if he was trained correctly) would have made sure the LP system was OFF and that the interior appliances were in the OFF mode
5. Since LP is heavier than air, there must have been a massive amount of LP on the ground. Even with the 80 percent valve open during fill, the amount it would bleed off should have NOT be enough to get to an ignition source. While LP is heavier than air, if you have an excess amount, the surrounding wind and even walking around can easily whip it up higher to get to that ignition source. Doug