This is some info on ways to hook up to 120VAC receptacle in your house/garage that might be of some help. You will need a RV Adapter to get down to the 120VAC plug. ALot of us carry the various RV adapters with us when we are on the road to cover all of the power circumstances...
I would have to use two adapters to get a 50AMP Shore power down to the 120VAC Receptacle plug.
First is to convert the 50AMP Trailer Shore Power Cable to the RV50AMP FEMALE to RV30AMP MALE adapter
RV50AMP FEMALE to RV30AMP MALE ADAPTER
Then you will need to ADAPT the 30AMP MALE ADAPTER down to the 120VAC MALE PLUG using this ADAPTER
Now you can plug these two adapters into a 10 GAUGE 25-50FOOT HD Extension cord which you can plug into a GOOD 120VAC Receptacle in your garage. You really want to use a 120VAC RECEPTACLE that is close to your Garage Breaker panel and doesn't have other receptacles in the loop. I use a 120VAC 20AMP RECEPTACLE that was installed for a stand alone Air Compressor in my garage.
This is what I would do at my house for one of my parked RV Trailers.
I would also make sure the 120VAC RECEPTACLE is wired correctly using one of these 120VAC CIRCUIT TESTERS..
If the bottom two YELLOW LIGHTS are ON as shown above then your 120VAC RECEPTACLE is wired correctly. All three conductors must be used in your receptacle that you want to plug into...
Under NO CIRCUMSTANCES would I ever use any of those small round RV ADAPTERS as they will get hot and destroy your good cable plugs...
Your high dollar RV CABLES will end up looking like this and will have to replaced...
I use 10-gauge Extension cords to feed my trailers at home and you could get away with 12-gauge but may start seeing some voltage drop and heating of connections for the high current items in your trailer. I would NEVER USE those 14-16 gauge extension cords you find at the local hardware stores. I lucked out when I was looking for heavy duty extension cords and found two 10-gauge (10-3) 50-foot contractor type extension cords for $50 for the two...
If you want to test each of the 120VAC ADAPTERS use these two pictorials as a guide on what you expect to measure using a multi-meter
RV 50AMP SERVICE
RV 15AMP-20AMP-30AMP SERVICE
This is how a typical CAMPGROUND PEDESTAL is wired up for 50A and 30A service... NOTE adding 20A SERVICE is exactly like the 30A service except it is fed with a 20AMP Circuit Breaker and uses the appropriate socket.
ALL IMAGES from GOOGLE IMAGES
FOOD FOR THOUGHT
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