Sorry you can't use the cart,
@Cynner. Do you still have your trip planned to WDW for those dates anyway and just won't need the cart? Looks like you are doing a 3-way split stay then according to your signature currently.
Given that cart rentals can only be made to Fort guests, I'm sure a cabin/camper guest will snap it right up.
Gonna be crazy around WDW on the 50th anniversary.
Thanks for letting folks know.
Bama Ed