Are we talking size by measurement or do maritime rules of tonnage come into effect? Also, I feel like top down is cheating because once you take out the passenger seat you have half a pickup truck & are limited purely by your own ingenuity.
Supposedly the point of the side plastics in the rear cubbies is that removing them allows golf clubs to fit. I kinda hate golf so I've never felt the need to test this fitment.
Full backpack, full suitcase, two socket sets, grinder, drill + batteries, charger, hardware box, helmet, HANS, floor jack, 2x jackstands, bos of zipties, box of bungee cords, 2 take-off tires (because I had the tires changed during the 15 hour drive from TX -> NC and wanted to keep two), racing suit, bulging full tool bad, fire extinguisher, tarp, full size spare and OEM jack, tire iron, quart of oil, other stuff I forgot.
Driver seat not adjustable and with a rollbar obstructing space.
Picture on the way, had to store one of the take-offs on the deck lid with bungee cords.