If you have a Tow, 5th wheel or Class A, B,C or even Van build, this question will come up. “I have an alternator, somewhere, how do I use that to charge my house batteries?” Don’t read more into this until necessary. A charging alternator will dump power into your batteries with little to no effort. But to do it properly, it takes a small effort.
An alternator is really a dumb device. In general, it just spews out electricity at a rate that the belt that drives it. There are miscellaneous charge circuits, like regulators, that help, but, in general, it just throws electricity at your batteries. One has to ask themselves how much do you want to get out of driving? I would assume if you have solar on your rig, you charge during the day. If you also drive, you can also benefit from that too. If you are a night driver, then I would strongly suggest you put in an alternator charging scheme. Then you can use your alternator to it’s best while there is no sunlight.