The vinyl "bag covers" sold at most RV parts stores tend to slow down water penetration, but don't completely stop it. Seems that rain will seep through the seams and still saturate the jack, it just takes longer.
Most dollar stores sell a variety of small plastic buckets and trash cans. Almost always, there's one sized correctly to cover the jack and prevent any rain from getting under the cover. A couple of holes drilled in the bucket (or trash can) and an appropriately sized bungee cord and for around $2, you've got a jack cover that's more effective than the $19.99 version and will probably last longer to boot.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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