Door Latch problems of the 1999 Ford F-250

While driving on a bumpy road passenger's door opened. This has happened twice. Dealer has not been contacted.

This truck has many problems. Strarting with the transmission going out, the front right side of the truck there is a distinctive "clunk" when put into gear; either forward or reverse. Then going interior; the "door ajar" light comes on it thinks that the doors are not shut, but you can slam all 4 doors shut and it still thinks the doors are "ajar" so that will keep the interior light on while driving. The interior light will go out if you get up to about 20 mph, then when you slow down to under 20mph it will come back on. The "warning bell" comes on and stays on even when the truck is shut off. Next the seat belts will some times work and some times not. Either the are hard to pull out or they will not retract. The tailgate cover has warped in not even 1 year after we had it.