I'm also doing that switch.
I got one of those 50amp Intellipower units where it's got the new breaker box and the 12V
fuse block and the power supply all in one housing. I'll have to change the main input wire from 30amp rated to 50amp (I believe that's a 6 gauge wire). My rig currently has a long cord that just goes into the coach and wires up....I'll change that to a plug inside the wiring housing and then get a nice 50' long thick as your arm 50amp chord.
That being said, I can run my a/c (15,000btu) and my old magic chef microwave at the same time no problem.
Turn off your electric water heater
Like I told my wife...there are four big current draws (a/c, water heater, microwave, blow dryer)...you can have any two
When I do the swap, I'll post it on here. Won't happen 'til after summer though...I'm too busy camping!