Our custom engineered caster carts are one of the best investments you can make for your overall aquarium setup as your entire investment in livestock may depend on it at some point in the future. Our carts are rated to hold extremely large amounts of static weight distributed over many caster support points (each caster is rated up to 300lbs). The carts are intended to be permanently mounted to the bottom of your stand even when your aquarium is full, which not only makes initial install of your tank and stand much easier, you also never again have to worry about starting over on your dream tank just because you have to move it! Just drain your tank about 2/3 of the way down (like you are doing a water change), move your tank, and refill! Avoid painful losses of livestock and setup down the road! Notice: Carts are meant to hold large amounts of static weight over long periods of time - they are not meant to be moved with an aquarium full of water on top of them. Make sure the full weight of your aquarium, stand, and aquascaping do not exceed the Max Weight Rating of the cart.