Called AIMS today to inquire why they recommend the 4AWG wire size
The techs reason was twofold, minimize voltage drop and to avoid overheating of the chasiss receptacle wiring.
He also recommended to start the run at the battery bank and not the fuse panel. In my Vegas it is probably only about an 8 or 9 foot run to where I would mount the inverter the behind large drawer.
Think I will wait for some of our sparky's to give their real world opinions before I install my AIMS 1200!