Is it safe to use a 200foot run of 12-2 with ground in a 1/2 inch conduit to run all the power needs of a 2005 or newer full sized expensive motor coach. I moved in a place and we are both on the same meter and the power bill is sky high and I use very little power and they are and elderly retired couple home all day is this because of the voltage drop to them or something else.
I've RV'd for 30 years now. I think you'll find your motorhome is 50amp on 120volt if it's a newer model, check your owners manual or dealer. Also if this is a long time, "or very often," hook up, best to get away from extension cords and go with a proper box to box hook up, chance of burning up A/C or other items.