While everybody has offered good solutions, I think parking whatever will dictate what works. Most of these fast food places won’t let you park a big rig and consume 5 parking spots. Probably think about a soft sided Sprinter with 2 levels. Equipment on lower level and trash bags on top level. Windshield time will kill you and I can tell you no work during heavy meal times 11am to 1pm, 5 to 7 pm. You probably gonna need a fleet of 1/2 ton pickups. I used to have dunkin as a customer. We only took care of properties that went bankrupt and were closed. We were always underbid for maintenance work along with multiple locations you also run into different laws, regulations, and permits and prevailing wages.