I realize my rv is different, but when I changed my rad, we decided to order a new cross over metal rad pipe, as it was pretty rusty. Only two in North America existed. It cost me almost $900 CDN to buy it, and it took almost a week to get here to Ontario. Im not saying yours has this unicorn of a rad pipe, but when they are almost 20 years old, the parts are not always readily available. A good assessment of the entire engine bay is always good preventive maintenance. Its not something you want to do on the side of the road. We also changed my tranny cooling lines and rad lines. Maybe they didn't all need done, and I could have gotten away with it. After a two month, 6000 mile trip, Im happy to report no problems.