Installing 50/30 Amp Service on Acreage.....?

My suggestion, use the pedistals you are talking about but run separate circuits to each outlet. If the runs are 75ft or less use#12 wire on the 20A circuits, 1 ea bulk, why, & green wire per circuit. For the thirty amp use #10 wire, one each, bulk, what, and green wire. For the fifty amp use #6 wire, two black, one white and one green. The black wires are your hot legs, the white is neutrals and green is ground. With the #6 wire you can just use all black then using electrical marking tape wrap both ends of one black wire with white tape one other wire with green tape. Make sure to wrap the wire far enough to get the green and white back into the.conduit so someone after you will know what the wires are. By doing this you get the full amp load from each receptical. If you are going over a hundred feet with all the circuits go up one size in your wire. 12 = 10'. 10 = 8, & 6= 4, this will account for voltage drop at the greater distance. All wires to one pedistals can be run in the same conduit, check with an electrician for the correct conduit size.