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Choosing the right casters for moving extreme loads outside can be a bit of a challenge, as there are several factors to consider. Here are a few things to keep in mind:

Load capacity: The most important factor to consider when choosing casters is the load capacity. Make sure the casters you choose are rated to handle the weight of the load you will be moving. Be sure to consider the weight of the load, including any additional weight that may be added (e.g. water, snow, etc.).

Terrain: The type of terrain on which the load will be moved is also important. Casters that are designed for use on smooth, hard surfaces may not be suitable for use on rough, uneven terrain. Consider using casters with pneumatic or polyurethane tires for use on rough terrain.

Weather: Consider the weather conditions that the casters will be exposed to. For example, if the load will be moved in wet or snowy conditions, consider using casters that are resistant to corrosion or that have a sealed design to protect the bearings.

Swivel or Rigid: Decide what type of casters you need, whether it will be swivel or rigid, depending on the need of the application. Swivel casters offer maneuverability and flexibility, whereas rigid casters offer more stability but less mobility.

Brakes: In some cases, it may be necessary to use casters with brakes to keep the load from moving unexpectedly.

Size of Casters: Consider the size of the caster wheel, the larger wheel will give better stability and also reduce the effort required to move the load.

It is always a good idea to consult with a professional caster manufacturer or supplier to ensure that you choose the right casters for your specific application and needs.

Remember safety first, always use caution when moving heavy loads, and make sure that the load is properly secured before moving it.