If you have a pedestal with 2-30 amp outlets and 20 amp outlets they most likely have 240 volts going to that pedestal. The 30 amp outlets are still only 120 volts because they are being fed from separate phases. The pedestals that we install with 1-30 amp outlet and 1-20 amp outlet are still 240 volt pedestals with the 30 amp outlet on one phase and the 20 amp outlet on the other phase. These pedestals are rated at 70 amps and get fed from a 200 amp 240 volt power supply. They are feed through design so several pedestals are connected to the same circuit. Its hard to say how many are pedestals are wired together as when the campground was probably built, campers didn't require as much power.
2004 Wildcat 28BH
2012 Ram 2500 CCSB 6.7CTD