Can I store things under my grill? Only one propane tank should be stored underneath the grill at a time. Check out our blog, "Storing Items Under Your Grill" for more information on this topic. Related articles How can I convert my grill from liquid propane (LP) to natural gas (NG) or vice versa? How long does my LP tank last? What disposable cylinders can I use with my Q? How much weight can the side tables on my grill hold? Are there stainless steel grates for the Genesis II series?