Backup camera hardware and install doesn't affect screen size. Audio Design will be the highest quality install. You can choose backup camera quality, prob $400-800 depending on what quality camera you want. If you go with Audio Design you will be guaranteed good service and install.
Call Michael at Audio Design. Tell him what you want and he will give you a quote. He did my alarm and sound system. They are knowledgeable and stand behind their work!
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