Multiple WANs and Multiple LANs running hotspot ??

So, I have been running multiple hotspot locations for over a year now with Netmetal on AP bridge connected to main office and a client CPE with AP on the location where hotspot is located, noticed some locations were over crowded whie some where nearly empty..

so i decided to switch to RB1100 and load balance 5 Wans with 5 LANs with same network running same hotspot where a voucher would be valid for all locations instead of one site only, turns out its not as easy as i expected given my knowledge is near basic in this matter… any help would be greatly appreciated..

could you give me some pointers on this matter..