Its hard to find rv eguipment that you can loop any thing larger than 250's thru so use 250 mcm with a full size nutral. I use 250/250/4/0 USE direct burial and use the 4/0 as the ground, reidentify with green tape and run a single 250 with the group for the nutral and reidentify with white tape.
I would just start out with a 200 amp breaker hit a terminal box.The runs are to long to just use one feeder. so break it up and run multipal feeders from the terminal box.you may have to run a feeder all the way to the farthest pedistal just because of voltage drop. I hope this helps.
John P
