Progressive Industries
A surge protector sits between the campground power post and your RV and is meant to guard the RV's wiring and appliances from power problems at the site. If you never plug into shore power (for example you run only on batteries or a generator), you may not need one.
RV and trailer owners who plug into campground power.
Progressive Industries SSP-30XL Portable RV Smart Surge Protector, Black, 30 Amp (ASIN B015Y9MX38). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B015Y9MX38).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.