Each Event allow you or the customer to choose a surface that the equipment will be set up on. This surface can control what kinds of items need packed along with the rented inventory. For instance, a bounce house set up on grass may require 1 - Blower, 4 - Stakes, ect... while a bounce house set up on pavement would have 1 - Blower, 8 - Sandbags, ect...
This area of the settings is just defining what your surfaces types area, and if the surface will charge a flat fee for it. The individual items for the packing list are defined in the rental item separately.
The flat fee cannot currently be multiplied by the number of tie downs for tents or inflatables at this time.
The sunset toggle is generally used for portable movie screen rental companies, where the start time of the event is generally at dusk, unless setting up indoors.