I gotcha, you would need a higher actual brake power.
That level would be overkill for a stockish 4500lbs Explorer, and make the brakes/tires lock up at speed easily. The first brakes I had(OEM 1965-82 Corvette calipers(2x 1.875" pistons)) did lock up the brakes at full pedal at 80mph. The ABS was very busy if I mashed the brakes. The SSBC calipers I have now are the smaller of two options, and these are a good match to my 4700lbs truck.
Those big Wilwood calipers are bigger in area than the Corvette pieces, so I expect I'll have to change the master cylinder also to reduce the power a little.
So I'm not sure how close those would be for your truck. I did begin my custom brake project with calls for advice from pros. I found a man(Todd of TCE) at a well known business who does a lot of brake work, and he steered me to the rotors, and I had him make the rotor hats. I have three sets of them, and a fourth which he made up from an existing Subaru hat.
It may be possible to combine some of what I've worked with, and have for spare pieces, together and create something worthy of a heavier truck. The brake power does need to match the vehicle weight and master cylinder etc. For sure the appearance brake choices will be inadequate for you if you do have a 6k weight.
I will try to keep that in mind when I do get serious with the custom caliper brackets. Those are the big key to any upgrade, they locate the other parts. I'll see if it's possible to make them work with a slightly different rotor thickness(which means moving the caliper outboard). That requires the rotor to set out a matching amount, so a question to Todd might discover that the rotor hats can be turned down(offsets the rotor outboard).
I like the 12.75" size because it lets me use the 16" wheels with snow tires I have for rare Winter use. If that wasn't a restriction, a 13.75" rotor would then make the restriction 17" wheels.
I'll let you know if I make good progress on my Lincoln(it needs paint bad), and my Mercury too(TLC, corrosion work, AC, and stereo).
