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Hi my name is Robert....
Sorry for the delay I see no other experts have responded. I am sure the upgrade to the dash monitor can be done but I would have a RV shop tackle that project, there could be allot of wiring modifications that need to be done and can be a difficult task. I know there are RV shops that have specialist in the audio video field and that might be the best option if you want to upgrade. I do not think the shower door can be adjusted if the hinge sprung the door may need to be replaced but I would have a shop look at that is well, hard for me to say without looking... Robert