The $650 is to install the electrolytic module. I know it works on ships, not so sure on vehicles.

The rockers will rust bad.

As well as the cab corners.

For now, I think I will do the FF or WW, whichever the local guy has (not the Line-X guy with the electronic rust preventive). We don't have Crown down here. He said I can use his equipment and do it myself as he hates doing it so I can put it on good and thick. I don't know it would get driven much in the winter yet anyway, but I don't want it to end up like our 2000 Durango underneath. The body is good, but the front end had to be replaced, including the springs, because of rust.