This is how I maximize the gas discount benefit despite having a car with a small gas tank:
That picture was from fall of 2017, right before a storm came through. I figured I'd use up a gas discount (I think that one was actually from Speedy Rewards) and prepare for the storm at the same time. The storm wound up fizzling out, but at least I had gas for the snowblower all winter.
The shelf also comes in handy for schlepping mogas to the airport, waste oil and other hazmat to the county collection center, smelly garbage to the
dump transfer station, propane tanks for the grill, stuff I buy that's too big for the car's trunk but not big enough to justify pulling the trailer, and deer to the cutter should I ever actually shoot one. The nozzles on the cans are the only newfangled ones I actually like, and the cans themselves are also very good. They have handles on the sides facing the bumper that make them easy to use with the nozzle pointed straight down.
The shelf is actually much higher off the ground than it appears. The proximity in the picture is an optical contusion. It didn't come with the lights, but I thought they were a nice addition. (I don't use them when carrying gas or other hazmat.)
Along with the trailer and hitch, the shelf is among the better investments I've made, especially since the hitch was essentially free (purchased using accumulated Amazon gift cards from Speedy Rewards), and I installed the hitch and the lighting kit myself. They've more than paid for themselves in saved shipping costs for stuff I would have had to pay to ship, including the grill that is the topic of this thread.
Rich