Large slide fuses can also be located within 18 inches of the battery. There might be a "pigtail" fuse holder just inside the camper where the red wire from the battery enters the camper on its way to the converter.
Highly recommend replacing those single blow fuses with an auto-rsetting one of the SAME current rating from the auto store.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW