We have a 2001 Coleman Bayside Elite, it currently has a 20amp converter (I think it’s a WFCO). I want to add more lighting (exterior porch lighting and interior floor lights), a TV(DC powered) & stereo system. The current converter is noisy and probably not very efficient. I’m currently looking at the WFCO WF8740PB 40amp converter. Aside from cutting a larger hole, would this pretty much be a drop in replacement? Or have they made changes to the way these are wired up in the last 18 years?