Sorry to hear about your loss. Glad to hear you guys got out ok.
I know you have made contact with your insurance company, you may also want to check to see if there have been any issues like this with other trucks of the same model. Make sure a good insurance investigation is done, this will help your insurance company possibly recover cost from a know or previously reported issue with the rig.
Good luck and hope to see you guys back on the road very soon.
PS I would be in trouble if I did not also add, make sure you have "Fire Extinguishers" close by, and you have been trained on how to use them. You need a big one for the truck and one for the camper.
Be safe:::::::)