Are you sure that your Hi-Lo has a fuse panel?
I'm not familiar with your year/model of Hi-Lo, but I can tell you that older Hi-Lo's didn't have a fuse box. My 1969 only had a few inline fuses, located either on the tongue, or by the battery (under one of the table couches). Clearly the DC system was WAY simpler than that found on more recently built rigs.
I'm not sure of when trailer DC systems started sporting a fuse panel.
1967 17' Hi-Lo Bon Voyage (1967-1969)
1969 19' Hi-Lo Bon Voyage (1969-2011)
2004 27' Hi-Lo TowLite (2010-present)
2015 Chevy Tahoe LTZ