I am adding 10 more RV spaces to my RV Park and am estimating costs. The 10 sites are in one row and each provides 20,30, and 50 amp service. The actual amperage used is usually evenly distributed between those customers using either 30 or 50 amp service but not both. 20 amp is used for a 13 watt security light. I need to know what size aluminum wire is needed. The Transformer is 200 feet from the row and there is 30 feet between each site so the last site will be 270 feet from the start of the row to make a 470 foot run.

Sorry, but this is a job for an electrician, not a do-it-yourselfer or handyman.