I'm looking at the adjustable aluminum ball mounts. I have 4 trailers 2" and 2 5/16" balls. They are all have different hitch heights. they range from 5000 pounds to 14000 pounds. The aluminum mounts look nice and are easily adjustable. Anyone have any experience with them. I'm wondering if they are rugged enough for heavy hauling. Does the aluminum wear in the receiver? Please share any information or previous experience.