I agree with the above posts. Voltage drop is your problem, when volts drop, amps go up. Run a dedicated 10/2 with ground and install a 30 amp outlet. This will only allow you to run AC at a time though. For a 50 amp outlet, you will need a 6/2 wire with a 50 amp outlet.
Ron & Ann
2016 Wildwood Heritage Glen 282RK
2015 Silverado 1500 5.3 355hp 3.42 rear gears