for big heavy cars I would go semi metallic for stopping power. unless you go really high end ceramic.
7200 lbs gross weight lol
Semi-met without a doubt. Ceramics don't have near the cold or hot stopping power semi-mets have, which is why companies like EBC, Hawk, etc., have severe duty/truck/whatever pads that are exclusively semi-met pads. Hawk does have one ceramic pad that's supposed to have about equal stopping power compared to their LTS pads, but no ceramics match the next level of pad of theirs, like the 5.0 pads.
Of course, dusting becomes an issue, unfortunately. For instance, took some new ceramic Akebono pads off my truck right after I purchased it and replaced them with a set of EBC Yellow stuff pads. The difference was dramatic. Much more cold grip and couldn't get them to fade, including being "pushed" down a mountain with a 5000# trailer on the back.
But for the most part, the vast majority of consumers will be well served with ceramic pads. Little dust, very quiet, very rotor friendly.