Just in case anyone (else) here is working on a 2 ton Chevy truck or bus chassis, there is a chap over on the Stovebolt (Chevy) forum that has put together an excellent 14" disk brake installation kit that will fit these vehicles. He built the system for himself, but since he owns a large machine shop, has offered them to anyone else who might be interested. This will make a huge difference in the complexity of adding real stopping power to these vehicles, so if interested, below is the link to that thread. I hope this is OK to post here as I saw it as a tremendous opportunity for owners of these older units. And while I have not confirmed it yet, it appears that this adapter arrangement may fit a 1.5 ton as well. He has templates available for free to anyone interested.