Sorry about your costs. Unfortunately, tires should be basically replaced at 5 or 6 years even if tread is great.Rubber gets hard and tire can fail.I had it happen with a dualie tire. House batteries last only so long depending on useage and other factors. It is really a service item that is not unusual. Brakes are also service item so not uncommon event. If your vehicle is reliable otherwise and you are happy with it, you are correct to note that "these expenses are making me a little bit crazy,but they are'nt enough to justify the expense of a new rv". Absolutely. It seems many Rvers keep their B Rvs long term and keep up maintenance which is cheaper than a new one if it costs you a grand or two a year,really! Happy rving...
AL