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Also, does anyone know whether the following upgrades are worth it? I am not sure what options we might need, or if they're necessary, and would appreciate any opinions.2.0 pound foam coreextra thick vapor barrier (5mil)I don't know about these options, but having had a 10 years of use. Reinforced hinge and straps is a useful option. My last cover is still in good shape on all its seams.Thanks!