Thank you time2roll and BFL13.
I was leaning towards the PD as on this site some have posted the PowerMax doesn't go in to boost mode. Which seems like the problem I might be having. I have the trailer plugged in to shore power and it measures 13.65V DC. measured at the box as well as at the battery terminal - but no batteries connected. It seems like it should be in boost mode right now, trying to boost charge. Reading the WFCO manual it should be at 14.4 boost mode with 13.6 as absorption and 13.2 at float mode. Not sure I am getting those numbers correctly. Reading on the PD, it looks like similar stages. I also checked the AC side and it is at 118V AC.
Thank you for the info on the charging, I will bring a charger with me and just use that if I need to charge the batteries, bypassing the WFCO. Although, we usually run AC power when we run the gen just to have power. I'm not a fan of running the gen, but the wife usually wants to run a hair dryer, coffee maker or Micro when we use it. We won't be needing A/C this time of year...
I think my next test will be to plug in the new batteries, run some lights, etc, let the batteries run down to 80% or so, then use the WFCO to recharge and see if it charges, if it does, then I don't need a new converter, if it doesn't then I do. I think a lot of what I was seeing was the bad batteries. I know from past experience when the batteries start not charging correctly, everything else goes haywire. I can also check my amp draw when doing this to see if I am getting a draw when I think everything is off.
Again, thanks for the help. I read this site a lot and get lots of ideas. Some day we will upgrade and probably need even more help.