For those that don't know about the awesomeness of caster wheels, it's time to see the light. These little wheels attach to the bottom of heavy equipment. The wheel part sits inside of a caster frame and this allows the wheel to pivot or be locked into place.
There are many options when it comes to caster wheels. So even if the equipment you own does not have caster wheels, you can add them. This is where you need to be careful. Most of the time you will want a set of simple stem casters attached to the bottom of your furniture. Stem casters usually have a stem on the side and top of the wheel, and they can be very inexpensive. I've seen them as low as $3.35 at www.accesscasters.com. That is cheap. Yet you should inspect the item you are attaching the casters to before you make a purchase. You don't want to buy and return caster over and over until you get what you want.
Some items you want to attach the wheels to are not level and even on the bottom. This may not be a big deal now. Once you add the wheels on the bottom, you may run into some problems. The wheels can become difficult to move around, and could incur damage from the incorrect strain you are putting on them.
I had this problem with an antique desk in our office. The owner loves this desk, but moving it was a pain. The old wheels on it where damaged, and one of the legs did not even touch the ground. My boss thought he would have to pitch it, but I saved the day. I ordered a set of leveling casters. These advanced casters have a wheel and a base to sit on, and they can be leveled appropriately.
I soon learned how awesome the leveling casters where when I had to store the desk in the basement for a remodel. The basement floor is very uneven, but these casters had no problem with the uneven floor. They are more expensive that stem casters, but they really are useful.