How much converter/charger is really needed?

Let me give you a little background. I ordered a PD4655V converter/charger. When it came, I installed it. I have been fat dumb and happy for the last 18 months with it. After 18 months, I found the box and discovered that when I bought it, they accidentally shipped a PD4645V by mistake. I am wondering if it is worth my while to pull out the 45 amp unit and install a 55 amp unit. One day, when these batteries die, I may go with a pair of GC2 6v units, or a pair of group 31 AGM batteries, but that will be years down the line as the batteries I have now were brand new when I installed the converter.

We do boondock a lot, and I have a 2000 watt Honda. I also currently have a single 80 watt solar panel on the roof, and am seriously considering adding 2 more of the 80 watt panels. That project is very likely to happen.