charging of 2 camper batteries with truck alternator?

I put the 3 trucks in to let Ford know that I have bought 3 of their products. Sometimes, companies need a reminder that brand loyalty does exist, and that customers can ask for more details on how a system works. If they blow me off again, that means I go to a "higher power" at Ford to get an intelligent answer of a reasonable question. I'm retired, and while I drink my coffee in the am, I can pester. I suspect a lot of posters have that same ability and opportunity!