30amp camper plugged into 110 home outlet

If you have a 30 amp RV and use the adapter I think you have (or similar) you still have household 110/120 voltage, but now fewer available amps to power your RV appliances. HOWEVER as the distance of any extension cord increases and as the wire size is reduced VOLTAGE DROP ACROSS THE CORD INCREASES. Depending on the length and current draw and wire size, you could end up with considerably less then the household voltage you started with. When I get over 50 feet I prefer 10 Gauge RV extension cords for RV use to reduce line voltage drop. Sure 12 Gauge or even less will supply small current RV loads, but if you're talkin an AC or Microwave etc Id like 10 Gauge especially for long runs. Again this all depends on distance and wire gauge and current draw so the above is ONLY general information.

John T Retired Electrical Engineer