Ok. Seems they spec abundantly cautious. Of course they dont know what a specific installation will consist of and assume worst case scenario distances etc.
But given you limited shore input to 30A and even if operating at max inverter assist, total 47A. A camper size length of 10AWG could safely carry that current for duration until OCPD opens. 8 or 6AWG definitely will.
Given your output OCPD is about 12” away from the source, all conductors inside FMC, I dont think you have much to worry about.