1990 Suburban

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Hi guys. I recently just got my new..well old..Sub. I love it. But I hate a few problems, and I was wondering if you guys could help me. I’m not really good with cars, and don’t know much about them.

First off, does anyone know where I can get the third row seat? Or if it’s worth giving up the room? Is it worth the price I will have to pay?

Also, my back doors rattle when I’m driving, how do I fix this? I shut the as hard as I can, and that helps a little.

Third, my back passenger doors, the ones behind the front doors, the locks are broken, or hard to work. Like on the back passenger side door, I have to throw a lot of muscle into pulling it up to make it unlock. What can I do to fix this? Do I have to like take off the door panel and clean it or what? On the back driver side door, the lock is totally broken off, and cannot be pulled, what do I do about this? Again just take off the paneling and put a knew one in there?

Also, everything is totally stock. Except for the bigger all terrain wheels I had put on there. Is there anything I can do, that will help my truck? Say performance wise? I live in Las Vegas. So when I go off-roading, it will be more rocky/dusty, then it will be with things like trees. Also I will be taking it into he snow as well because I snowboard. If you guys suggest anything, can you tell me how much you think it would cost?

Thanks for the help in advance!