I got rid of my WFCO because it would not go into bulk charging mode no matter how low the battery got. I installed a Progressive Dynamics unit and am very happy. My TT stays plugged in unless we are on the road. The battery is still in good shape at 2 1/2 years. Time will tell.
My old class C had the same problem and I put in a Progressive Dynamics converter but left the power distribution center in tact. That was an easy job of removing 2 wires from the old unit and hooking them up to the new. The breakers all stayed in place.