I have the original RS2000 inverter/charger that seems to be failing. I assume that I need to replace it with another Xantrex unit to retain all my VMS400 functions. Which current Freedom unit is a "Plug and Play" replacement. - do you have a model and part number? Also, at the Hershey RV show - Xantrex rep said a new Freedom XC Pro was coming out that will also be a direct replacement for my existing RS2000. ??? Greatly appreciate your help. Knowing how the Apex is set up - a plug and play replacement essential.