A thorough inspection of your hoses (light and a small mirror will help) should reveal any bulging, softening or splits. If it aint broke, don't fix it. We used to run a "preventative maintenance" system on our fleet in the 70's to 90's with good effect (very few breakdowns) but with a lot of inferior replacement parts these days, I would stick with what you have until it becomes obvious that you have a problem.
Hoses usually give some warning of impending doom and a cloud of steam should tell you to switch off and park up anyway before anything major would be damaged!
