Here's photo from when I went looking for a latch conversion. The PO had the tire carrier and a gas carrier both with the wingnuts. OK for an open top, but very inconvenient with a hardtop. Protofab told me that they no longer sold the latch conversions as a kit, because the installation was too complex to describe over the phone. I sent in the bumper for the latch on the tire side, and the results are great. That latch design is indestructible.
I'm in Golden if you're interested in the gas/cooler carrier, or if you just want to see the design.