I have had old boats and currently have a 12 year old RV. One thing I have learned especially my last boat which was a 1997 Silverton 372 basically a 40 foot boat with lots of stuff to keep running. Everything has a life span and has to be replaced at some point. If you don't know the history of it, then the only way you know how old it is, is to replace it. A 45-year old RV will need to have lots of work unless it was done already. If they are old and rusted, I would replace them when I know the tanks are empty, so I didn't have to deal with it when they have contents. That is not something I would sit on. Everything has a life span and most owners manuals will tell you, but I am sure you do not have one, so trust your gut. Otherwise, you may have fines if that happens at a RV Campground or going down the road. I would make sure all engine items have been serviced or replaced like belts and radiator hoses. Tires are only good for 6-years, so how old are your tires? Nothing like a front tire giving out at 60 mph on the Interstate. Change oil and all fluids as they only last a year or two. Same with the generator. Ask yourself, do I want to enjoy the hot summer, or be working on the side of the road fixing my RV? The choice is yours. Hope to see you in the campground and not the side of the road. Oh, get a towing plan.
Oh, if you replace the valves, what about the hoses/pipes?
All the Best!
Dave
