They aren't too friendly about site requests. I just got lucky. I had requested 1300 loop and when we checked in, I stood there with the app in hand checking the "available sites". They gave me 3 choices in the 1300 loop and that was the best. Your rig should be about 6' longer than mine, but you should still have plenty of room. The ground drops off gently behind the pad. You should be able to park so your ramp is just at the end of the pad and you will be able to unload the cart just like that.
It was a pretty easy site to back into and it is the last in the loop so you only have 1 neighbor that is close.