Caster load is the amount of weight that is supported by the wheelchair casters. Too much weight and the chair will be difficult to push, too little weight and the chair may tip over backwards.
I’ve just added a new article about caster loading, the causes and steps that can be taken to minimise the effects.
For those who are interested in reading this article it can be found at https://mobilitybasics.ca/articles/caster-load-information