A off the wall method. Elect a SPL to run the troop during meetings and be the turn to person at camp. For each camp have the scouts elect a patrol leader for that camping trip to be in charge for that outing (Planning, staging and running). This will help in many ways, Each scout will develop a understanding of leadership roles, As your troop starts to grow the scouts you have know will have the basic skills to be patrol leaders, Your SPL will learn how to support and lead different scouts as patrol leaders. Your SPL should help each new scout get ready for the campout.
BRAZZIN