Jerry,
The hoses that go to the filter are made of rubber. The only hose that is an issue, that we are refering to, originates near the alternator but travels close to the turbo and exhaust manifold. That is the section that gets hot and brittle and tends to fails. I do not know if your year coach has the issue with a C12. The SMC era coaches have the issue and maybe the Roadmaster C12 versions could also have the problem but I am not sure if a factory change was incorperated somewhere along the way....really not sure, maybe Gerald or an owner of your vintage/model coach has the answer.
Later Ed