Wiring - Solar Panel - Solar Controller - Converter

I'd suggest to make this an upgrade project for your RV rather than an improvement of what you have. If your converter is flaky, get another. While you are connecting the new solar controller and new converter, put in place a wiring schedule that is the best for your batteries. That usually means putting in bigger wire. Yes, it costs more money but replacing batteries on a very shortened schedule is also expensive. In fact, it can be much more expensive.