Which combination of casters is preferred for luggage carts?

The casters of luggage carts include fixed wheels and universal wheels. Although different casters have different characteristics, the advantages of fixed wheels are that the car has a high bearing capacity and the wheels are more wear-resistant. It will be very difficult to walk on some uneven roads. Labor-saving; and the universal wheel is very flexible in the process of use, the luggage cart can go from multiple directions, pushing freely, reducing a lot of unnecessary trouble, for the luggage cart, the casters are more inclined to the front wheel universal wheel, The rear wheel uses a fixed wheel.