There's no item limit. A Lugg includes as many items as can safely fit in the vehicle you book, whether that's a Pickup, Van, XL, or Box Truck. Your crew will load everything they can in a single trip.
If everything doesn't fit in one load, you can add an extra stop to your booking for a second trip, or book a separate Lugg. For help choosing the right vehicle size, check out What are the dimensions of Lugg trucks and vans?.