I think your best results would be to get a BLUE SEA or WEST MARINE type matching 12VDC PLUG/SOCKET that is used in boat and marine units... ETRAILER should have something like this as well...
I have tried other brands from autoparts stores and they always over heat on me when I try to pull 4-5AMPS DC current through them
Using a matching 12V PLUG will give you the best results...
Something like this from AMAZON should work just fine for you... Be sure to use at least #12 wiring or higher rating...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS