for all those that have tried to eliminate the rear door rattle on their 150 prado i have succeeded, not sure on how long it will last but it is quick and easy to redo if required.
I used rapid fix to rebuild some broken plastics on the spoiler and also used STP Bitoplast Tape to take up any play on mounting and contact points.
I also used rapid fix with the welding powder to build up the door catch and rests. I won't go into great detail as it's pretty simple stuff, few photos should be all you need. Feel free to ask questions if you get stuck, right now there is zero noise.