2009 Dodge Journey Awd engine problems

Had been intermittently seeing white smoke come from under the hood or front undercarriage of vehicle. No cause visible to the eye was found. On date in question, engine area caught fire while driving at a low rate of speed. Vehicle towed to collision shop where it was determined that transfer case/ pua unit was "bad" and cracked. No collision or external damage caused it. Part simply cracked for an unknown reason according to chrysler collision/body shop.

Have had ongoing issues with 2009 dodge journey. Vehicle loses power while driving, this has happened approximately 10 times in the last year. The tires sold on the vehicle (225-55-r19) are not replaceable. I got a flat and was told to ride on the donut until they could locate a new tire, 12 days later still no tire, I demanded the dealer sell me a tire off of a car in the lot, they finally agreed.