Lumber, drywall, plaster, lath, roofing, flooring, cabinets, fixtures, siding, furniture and ordinary household contents all load fine. The limits come from Indiana disposal law and from the Town's own container rules.
Indiana keeps whole tires out of its landfills, with narrow exceptions, and bars spent lead-acid batteries from disposal. Open dumping and open burning are illegal across the state, so burning debris on site in Clarksville is not an alternative to a container.
Hazardous waste, liquids, paint, solvents, fuel, used oil, asbestos, propane cylinders and medical sharps stay out of every container placed. Appliances holding refrigerant need separate handling, and mattresses and tires are usually billed per piece rather than by weight.
The local wrinkle is the separation rule. Rocks, brick, dirt and ashes are not supposed to share a container with other refuse in Clarksville, and anything going in should have free liquid drained from it first. In practice that means a second small container for the heavy inert material, which nearly always costs less than one mixed load.
Electronics, household hazardous waste and scrap metal have their own county route rather than a landfill. If an item is borderline, ask your account manager before it goes in.