Short answer there is no need to upgrade your converter/charger, but you will find it helpful when boondocking. I found with the OEM WFCO unit I didn't have enough allowable generator hours at most CGs to fully charge the batteries after a night of TV, etc, especially if furnace usage was involved. The WFCO would charge the batteries just fine if given enough time, but I was seeing that I could never get back to 100% in only a few hours of gen time each day.
First thing I did was upgrade the wire gauge between the charger and the batteries, I have about a 25' run the way the TT is laid out. They used the frame as the neg path, so I added a #4 in parallel to the existing #6 positive wire, effectively giving me a #2 wire there and back. I saw some improvement but the WFCO still wouldn't go into boost mode. Step 2 was to swap out the WFCO for a Progressive Dynamics unit and saw a measurable increase in charge rate.
The other option is to add solar so that you can trickle charge all day and not rely on a few hours of gen time to get the charging job done.
Since you boondock 98% of the time, you will likely want to do one or both to improving the charging efficiency of the system.
I got some great advice from some of the knowledgeable posters here (many have already responded on this thread).