Welcome to the forum. It was a pleasure having all of the Gators in Indy this past week for the Final Four. Congrats on your 1st NCAA Championship!
On to the question. You do have you hands full, don't you ? I have designed a couple of KOA's in the past, but it's been a long time. As I remember, we used a couple of distribution centers to cut down on voltage drop issues, just as you mentioned. We ran a lot of aluminum URD to the sites and the minimum as I recall was #2, even for a 50 amp site. We used 400 amp distribution centers and our goal was no more than a 3% drop at the distribution center.
Break it down into segments and it gets easier. Like I said, we used aluminum and that helped with the cost issue a little.
Master Electrician -Electrical Contractor
"The Code doesn't say what you think it says" - Charles E. Beck, P.E.