[JRTJH]

It's not just "your 80 feet" but the length of supply line (romex or extension cord) from the supply source that runs to the distribution box as well as the amp load that the other trailers connected to that line are drawing. So, you may check it carefully (when only a couple other trailers are connected and they have nothing turned on) and then later, with 8 or 10 trailers on that distribution circuit, all of them running their A/C and water heater and you may find that you're down to 90 volts and everything it "winding down"...

Of course with the progressive circuit monitor to "guard against damage" you should be OK, but you may find that whether you're running a 40' or an 80' cord, depending on the "quality of the power source and the load on it" your length of cord may not even be a factor. I've seen a number of "long cords" on both 30 amp and 50 amp trailers that work extremely well, just protect the plug in the middle of the line with a bucket or a watertite can. You may find that with a little rain shower, that plug is in exactly the same place as the only mud puddle in the entire campground......