Slow Paddler
SILVER Star
Yep! @tdcruiser406080100 posted a how-to here: Locating (hidden) captive nuts for ARB rear drawer install Heritage Edition - https://forum.ih8mud.com/threads/locating-hidden-captive-nuts-for-arb-rear-drawer-install-heritage-edition.1219139/post-13240503As for finding those extra holes to better bolt the plate down; good idea about using the plate as a template. I might do that.
On the other hand, the plate is bolted down using the 4 factory tie-down threads. Would Toyota have put in tie-down bolts that are insufficient to hold heavy weights down? Yes, I would like more bolts, but maybe I’m just over cautious.
And attached is a PDF on how to mount Outback Solutions' drawers using their template to find the holes. I haven't attempted it yet.
As to your question about the tie down bolts; I recall reading that the seat anchor bolts are a larger diameter than the cargo anchors, so using them is the safer option.