2005 Dodge Caravan body & structure problems

Driver side door does not open or shut completely. It only opens 6 to 8 inches and closes until about 6 to 8 inches. The latching mechanism sometime does not work at all or repeatedly tries to auto latch itself. This occurs every time we try to use the auto door feature. It appears that some wires have been severed, but the cost to repair at dealership is outrageous. I am afraid that the door will not properly close, leading to injury or death of my passengers.

Driving 2005 dodge grand caravan on highway at posted 55 MPH, bang sound under van, pulled over within 10th of mile, spare tire had come loose, was trapped under van, spare tire appears to never have been used, raised van up with a large rock placed under front wheel, drove up rock and with the decline of highway allowed van to come up high enough then pulled spare tire out, wife burned arm on exhaust pipe when pulling tire out, have not had spare tire placed back under van or inspected as of yet.