MOD Idea: Put a separate 20 amp into the camper for purposes of running 2 heaters. I know some have done it for a 2nd AC on a 30 amp unit before.
Same here but more so.. When I'm on 50 amp site I have two additional circuits 15/20 amp duplex outlets (Contrasting color from regular ones to make 'em easy to spot) and 12ga wire straight back to the breaker, One is 15 amp one 20.
Plus a added 15 amp cord and an "Break out" point for my 2nd A/C which also feeds a special 15/20 amp outlet (Single not duplex) cause I do not use Heat and A/C at the same time (and if I did the 20 amp breaker will never hold)
