Congrats on your KDEV- "Buzz the Silent".
Please also post if you wind up building a rack or box for keeping the kegs. The child seat Latch anchors are one good point, but won't do much to keep a load from tipping forward. I think there would be enough room to add a hook to the tailgate loop in the back bumper- possibly with a plate beneath that loop.
(Previous tiedown discussions here: )