So, I think I need a Hi-Lift Jack, my rear tire carrier has a nice integrated mount, and nobody in our group usually carries one, with our upcoming trip i guess I'm it...Looking at the different versions currently offered. I'm leaning toward the x-treme 48 inch. Anybody know if the Zinc coating actually holds up? Or should i just get one of the standard models? I see they have a Cast Steel and a All Cast version. Nothing that I'm seeing really talks about what version is really better. I know Zinc Coating typically holds up really well in the elements. Someone educate me.