6-month garage build: monthly rental or pay-per-service?
I'm starting a six-month detached garage build in my backyard. I need one portable toilet for myself and the crew of three to four workers, five days a week. The ground where I'd put it is level gravel, and a vacuum truck can back right up to it, so truck access is no problem. I got a quote for a standard unit, but the rental company offered two billing options: a flat monthly rate or a pay-per-service plan. On a project this long, which one usually works out cheaper? Does the pay-per-service option make you more likely to stretch the time between cleanings and risk it getting overwhelmed?