It was early morning quick explanation... :-)
A little more about that cheater which a sales guy tried to talk me into as well.
The cheater pigtail takes the 4 poles ( 2 positive 2 neg .. and I know this is 100% correct but it's a good simple explanation ).. which combined makes up 220 volts. When you use the pigtail it splits it into 2 110's. The converter on RV can't function if it doesn't have 220 volts. It can function with 20amp ( you'll just blow your house fuse if you pull more than 20amp.
BUT if you don't connect both of those pigtail ends you will not generate the full 220 volts. This is the part that they don't explain when they talk you into this thing. It's a ok tool if you only have a 30amp and a 20amp circuit at a campsite but you HAVE to plug in both of them.
This is what you want
50-Amp-to-15-Amp Twist-Lock Adapter - Item - Camping World
( example only .. make sure you check the twist lock side )
This is what you have..
RV Cheater Box - 50 amps from 30 & 20
( wierd that campingworld doesn't carry this..