I have been researching a big brake swap for quite a while. Most kits for our trucks use a front caliper/rotor made specifically for the application by whatever manufacturerer. The rear kits use a system cobbled together from Camaro stuff. Redrilled rotors, etc. Therefore the calipers look (& perform?) different. For a Wilwood system, there are no brackets, available through them, to mount the front calipers farther from the hub, due to the greater distance required by the larger rotors. Wilwood uses the stock master cylinder.
Baer is using the same principle for their system, although they have the front caliper re-location brackets.
For both, you have to modify the spindle for clearance of the larger rotors.
SSBC is the only Co. that manufactures a rear system, specific to our trucks, that is a match to their front system. They also offer a 'firm-feel' master cylinder of their own design. The front system comes with a new set of spindles, stock height or 2" dropped, pre-modified for the larger brakes. I may be mistaken, but if I remember right, the front system comes pre-assembled on the new spindles.
The SSBC system is somewhat more expensive, but compared to what you get with the others, & the fabrication involved for the install of them, I think that the SSBC is the better of any of the systems out there.
As far as the simplicity of the install of these brakes, the only reason to remove the axles, is to remove the backing plates. If you have the technology to cut them off, then you don't have to go through the draining of the rear just to remove the 'c' clips.