Ok I'm going to go full on redneck here.....no offense to my fellow RN's
You could cover the hole with a small piece of plywood, get a tarp and cut it narrow like 12' long by 4' wide and just use duct tape? The tape should should hold for a week or two and not be that hard to remove. I got all that in inventory.
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide