Of my two door racks, one is customized from a part for another van: http://herbiesworld.blogspot.com/2014/10/astrolander-update-rear-door-mounted.html
The other is scratch-built: https://herbiesworld.blogspot.com/2017/07/retro-post-astrolander-rear-door-rack.html
Both use the same basic idea of an "over-hinge" - a C-shaped assembly that fits over the existing door hinges. I drive out the original door pins (harder than it sounds), then put the new hinge over the existing hinges and put a longer pin of the same diameter through the whole mess. The rest of the rack is welded to the over-hinges. EDIT: Here's a photo of me checking the fit on the over-hinge after tacking it up.
View attachment 616088
The actual aluminum Propane and Jerry-can holders are from AT Overland: https://atoverland.com/
Thank you very much for the detailed post! =) What do you think about the effects on the tank in the event of a rear-end vehicle accident, in comparison with an accident when a tank is mounted underneath the van?