surge protector and water filters

I'd say go with the Progressive unit. Not cheap but definitely worth. Had ours on 3 or 4 trips & it would give error codes. Called the company. They asked for pics and the error code number. Then they told me to cut off the plug & trash the entire unit, a replacement was on the way. Got the replacement the next week. Gott love a company that stands behind their product.
Water filter: We use the Camco inline blue filter for every tank fill. Get a new filter every year and haven't a problem.