I just replaced the original "dumb" WFCO converter/charger with a PD 9245 unit. Replacement installation is simple. Unit includes an optional "Pendant" which you can mount outside of the enclosure to monitor what the converter/charger is doing. I replaced the two 6-Volt T-105 house batteries with two cheaper same type US brand 6-Volt batteries. My Trik-L-Start is working properly with the new converter, house and starting batteries keeping the starting battery up when rig is plugged into my garage 30 amp outlet.
http://www.bestconverter.com/PD-9245C-45-Amp-RV-ConverterCharger_p_170.html#.UoVSvnmA203