Keep in mind that if you are actually racing cars, trucks, boats, etc., in some sort of sanctioned races there might be a group that does sanctions for that where they require membership in their group.

For instance. I do some boat racing and despite having AMA membership and insurance I still have to belong to NAMBA to race boats. I am not sure if there is a similar group for RC trucks. Cars have ROAR, but I am not sure if that includes trucks or not.

And BTW KE, youth membership, which is what I think you were referring to, is now free (without a magazine).