use the search function for disc brake, kodiak, dexter and so on....
lots of info.
the j/c service center installs kodiak as do many dealer service centers.
stainless is cool and functional for the boat...not as much salt exposure on a land yacht...
new torsen double axle upgrades are about 2800$ which include the complete drum brake assembly.
4 discs would add another 1000$ or so to the price.
dexter or the original henschens are available....
where are you localed and do you want to do the work yourself?
visiit the kodiak website....
stainless and other models...along with downloads of the instructions...
don't forget the disc control unit and how it relates to your brake controller.
i've got 31k trouble free miles on the kodiaks...i like 'em.
ceramic pads are now an option which may last indefinitely.