Reflectix is just mylar coated bubble wrap. As such, leaving it uncovered on the bottom and it would pop or tear every time a rock or stick hit it. I use it as a near zero weight insulation on my windows with the dual use as reflecting sunlight that deteriorates and fades the interior. Works on roof vents and bath skylights. Keeps heat in on winter nights, light out if you are parked next to bright lights at night for better sleep.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
Andersen WDH hitch
Dometic Milenco Aero mirrors