I'd contact Winnebago and ask if they have a strategy to solve the problem. Cutting an access hole underneath might be the way to go, just make sure you can weatherproof the replacement 'hatch' for access in the future.
olks have cut open the floor in Class A's to access fuel pumps rather than drop the tank, and other dramatic mods to access things the manufacturer didn't plan for.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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