I use the Reflectix on mine. When the TC is not in use it is on the roof over the Heki. Reflectix is cut to overlap to the roof surface and industial Velcro to hold it down. Keep the fuzzy side of the Velcro on the Reflectix and the hook part of the Velcro on the roof so it does not soak up water. Stretch the Reflectix tight to keep the wind from rubbing on the Heki. Just replaced the first one that was put on when I got the TC. The Reflectix has held in 70mph winds here in my driveway but I would not drive with it on.
When in use and travel, I use a Reflectix cut to size to fit the inside of the Heki. There is 1/8" of space between the latches and handle mounts and the glass that the Reflectix can fit. Just slide it in and it helps to keep the sun and heat off the latches and handle mounts.
When the covers are not in use they are stored under the bed.