Where to get Replacement Wheel Bearings -Old Camper

Gary,
I don't know where you are in Michigan, but we have bearing stores all over the place. What you do need to do is get all 5 numbers. I don't know about your unit, but it may well have different numbers for the inner and outer bear sets and each of those is two part numbers. The seal is a third.
I hope the spindle isn't damaged. That often happens when a bearing goes bad.
When you get all 5 numbers, use a marker to write them inside a cabinet door so you will have them next time.

Matt