The short answer
A small park lives on one number, the lot rent collected by the 5th. Letting gives you that number from your bank export: paid, part paid and unpaid for every lot on one screen, with 1 to 30, 31 to 60 and 60+ day aging for the lots that need a notice.
Be clear about the limit. Letting does not read water or electric submeters and does not generate utility bills. If your park bills utilities back to residents, you keep calculating the amount your way and record it against the lot, while rent, aging, inspections and repairs run in Letting. If submeter billing is your main need, use a dedicated utility billing service next to it.