The chapter we are in, here in Northern Vermont schedules 7 campouts, April thru October, usually in full service campgrounds. A problem we run into, especially during the summer months, is that members who register late may find themselves without sewer hookups. Campgrounds will hold a block of sites for us up until a certain date then they release them for general use.
Our chapter has been growing and it is feared that we will have a more difficult time finding CGs willing to hold enough sites for us. Time will tell. We now have about 40 member rigs but less than half attend our campouts. Your problems may be a matter of chapter size.
Our State Samboree is held in a fairground and we only have electric hookups, no AC allowed, but that is not usually a problem here in the frozen north.
My wife suggests you attend more out of state samborees and talk to their members.