Chip,
Removing the battery for storage is not a "bad idea" In fact, it's a good idea, especially if you are going to have the RV in extended storage and don't have any way to keep the battery charged if it is stored in the RV. Maintaining the battery requires that it be kept in a "charged state" to preserve its function. Additionally, a discharged battery is subject to damage from freezing in a cold climate and will often (almost always) require a new battery in the spring. Storing your battery at home where you can maintain it through the storage time is convenient and makes keeping it in top shape easier.
So, it's a GOOD IDEA to remove the battery from the RV if you're going to put it in long term storage especially in an area where you can't maintain the battery charge state easily. Plus, if the RV is not stored where it is readily secure, batteries have a propensity to "walk away" when not being watched. Of course, that also goes for the propane tanks, hitch and most other items that can be easily taken off the RV. Depending on where you're going to store it for the winter, securing your RV may include removing most "loose objects" from the outside.
The purpose of a battery cutoff switch is to make disconnecting the battery easier and more convenient. How much an owner is "willing to pay" for that convenience is a personal decision, but you're right, paying hundreds of dollars does seem to be "over the top" when the components cost much less than that. I suppose it's up to the owner to determine how much value there is in having the convenience of a cutoff switch.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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