Everyday construction and household debris is fine to load. The limits come from what the receiving facility will take and from Maryland's road rules.
The county landfill refuses asbestos, ash, animal carcasses, car parts, chemical and petroleum cleanup waste, compressed cylinders, hazardous and medical waste, liquids including sewage, radioactive material, skids and pallets, and drums over 55 gallons unless they are cut down and flattened first. It also refuses construction and demolition debris, shingles and roofing, soil, rock and spoil, and stumps and logs, which all have to go to a rubble site instead.
Tires are a separate business in Maryland. The state licenses the firms that move them, so tires do not ride along in a mixed container. Keep them aside and mention them when you book, along with appliances and electronics.
Maryland also requires that a load be built and loaded so nothing can drop, sift, leak, or escape on the road, and that the load and its covering be fastened down securely. The county goes further and makes it unlawful to drive onto a landfill to tip unless the load is covered or secured the way state law requires. In practice that means nothing loaded above the rails, and it is one reason a tarped container beats a string of trailer runs.
Oil based paint counts as hazardous waste here and stays out. If you are unsure about an item, check with your account manager before it goes in.