Since you have removed the battery raises a RED FLAG to me. Hope the terminals are not touching ground or each other when you add external DC power or connect to shore power without the trailer battery connected up..
I was going to suggest nosing the truck up close to where the battery goes and use JUMPER CABLES being direct connected to your truck battery,,,
You just have to watch the polarity of the cables and not blow some fuses if you get them REVERSED...
My slide handle was laying in the closet floor near the bedroom.
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