The season has not started for us and will be delayed several more weeks. Spent the day yesterday and will spend most of today at the Kidney center with the DW.
So to try continue to try to explain what is going on,
Voltage is "pressure" being exerted on the electrons (water in our analogy) at the "beginning" of a pipe. It is the "upper limit" of how high the supplied voltage will be. It can never go higher (unless the pressure being supplied by the campground's transformer or the electric company is increased).
So the voltage "pressure" AT the beginning of the pipe that goes to all the camper pedestals on the circuit you are on will not change until someone connects and creates a PATH back to the Neutral buss at the source.
Now picture the "pipe" as a hose that can be stretched from a larger diameter to a smaller one by pulling on the far end. That results in a "tapered" hose that is larger at the source end and smaller at the most distant end. That taper is the effect of the resistance to water flow in the metal of the wire. The more conductive the wire, the less "taper" you get from the same length. The hotter it is outside the more taper the same material of the same length gets (more resistance for the same wire material as temperature increases). Copper feed wires are not effected near as much as aluminum feed wires (1/2 the resistance per foot as aluminum and much less effected by heat) but Aluminum feed wires are 10 times cheaper than copper and so most campgrounds are wired with it.
Now put taps evenly spaced along that tapered "pipe" The first guy gets the "full system pressure" only reduced by the loss in the larger diameter pipe for the distance from the circuit panel at the campground source to the first site (call it distance X). This site may not see ANY voltage drop ever no matter how many campers are on the parallel wired loop (provided the total amperage consumed by the loop never exceeds the circuit breaker's limit. Say 30 amps times 10 sites (300 Amps Available).
The last site however is a different story. While each site has 30 amps available to them, the pressure (voltage) is being reduced in the long run to the 10th site by 10 times the resistance loss per X feet.
So, say there are only 2 campers 1 on site 1 and 1 in site 10 each (for the sake of argument) pulling 20 amps.
The voltage each will see will be radically different even though there are 260 "extra amps" available. He will see the source voltage dropped by 10 times the line loss seen by camper one.
Much different for camper 10. Now he has low voltage due to line losses that are MUCH worse due to the heat in July (line loss goes up exponentially by temperature). What to do?
An autotransformer will take 1 amp of "available current" and convert it AT camper 10's site and boost the "effective" pressure at site 10 ONLY a few volts. NOTHING changes in voltage or amps available at any of the other sites. It is no different than site 10 turning on another light or turning on the TV in the bedroom as long as site 10 does not exceed the 30 amps available at his site.
Are you suggesting that someone CAN'T use two TVs at the same time because he is somehow "stealing" power from you?
Then the "power grabber" who is cooling his fridge with campground power is "Stealing Power" from me with that logic.