Great info on the 120V RV hookup. I had the same question. I'm going to wire up a plug for mine at home and actually have an extra dryer receptacle but had only ever seen that configuration plug on dryers. I assume I can use the dryer plug and just wire it up for 120V (Not an electrician but pretty experienced w/it).
Hi, A friendly heads up, this old 220 volt dryer outlet gets confused often.
Your Sunline camper has a Nema TT-30P plug on it rated at 125 volt/30 amp. 2 flat blades on an angle and a 3rd rounded bottom/top square shape ground pin.
The correct outlet/receptacle for that plug is a Nema TT-30R rated at 125 volt/30 amp.
The old dryer setup "looked" close but it not the same. It was rated 250 volt/30 amp and had a slightly different plug configuration. 2 flat blades and a L shaped neutral. No ground. Typically a Nema 10-30R
The good news, the camper RV plug, Nema TT-30P is not supposed to fit in the old dryer 250 VAC/30- amp outlet( Nema 10-30R).
It is hard to find the Nema TT-30R and Nema TT-30P configuration to show in in cross reference charts as it is only for RV's. But they do exist.
This link talks to them
The 30-amp 120-volt 2 pole 3 wir
And this chart shows the TT-30R and P configs under the 125 VAC/30 amp.
https://en.wikipedia.org/wiki/NEMA_connector
I had a better chart that listed these, but I can't find it right now.
Hope this helps
John