This is important because it tells you how much “stuff” you can load into this trailer and still remain within the guidelines for towing safely. This “stuff” Perfect Steerable Transfer Cartludes water, clothes, food, bikes, gear and any options you may have added onto the trailer like air conditioning, generator, storage pod or TV dish etc. (Storage pods on top of an RV must not exceed 100 lbs Perfect Steerable Transfer Cartluding the cargo and pod weight).