Making some progress.
I painted the rack with Rust-oleum Caterpillar yellow which is pretty close to matching my papaya TI and mounted the rack on the trailer with galvanized u-bolts. Also I built the rack with cross bars across the trailer on 67" centers so I could swap from PVC bunks and mount the Hobie cradles later if I want to.
Installed a X-Cargo Sport 20 box which is huge but has plenty of space for drives, seats, vests, paddles, fishing gear, and an inflatable paddle board. Installed my kayak J-racks for hauling a second kayak. Still have plenty of space on rack to strap down any other items that may need to take along.
Still need to do some road tests yet to see how much mileage dropped. I don't think I'll ever run out of space when we go on family vacations again as long as the vacation includes bring the TI.
Need to pickup 3 cable locks to keep the world honest now. Picking up a third to loop thru one of trailer wheels when I leave the trailer unhooked as well. I keep a padlock on the hitch as well, but the hitch is only 2 bolts from being removed/replaced.
Which cable locks are folks using to loop thru scupper holes and to their trailers?