This is sort of like asking "can I use a pressure washer with my well?" The answer is maybe. If your pressure washer needs 8gpm, and your well flows at 6gpm, no. Maybe. You can flow at 6gpm, keep up with the pump for a couple of seconds and let it rest, and probably not see a problem. If your well flows at 4gpm, then no. If your well flows at 12gpm, all day long.
You need to add up how much you use to find how much you need. I've never met anyone who can look at an electrical system and judge, by eye, how much current draw there is.
For example, say you have one battery. You start the engine once or twice a day, several hours apart, and operate the engine for hours at a time in between. Since the alternator has sufficient current development to supply all the current the electrical system needs, and charge the battery, which has lost X in Y time, you'll be fine. Then compare that with the same truck, with a low battery and 20 starts in an hour, with 5 min run time in between. There's a high likelihood that the alternator won't have enough juice to recharge the battery before it fails to provide enough current to energize the solenoid and start the engine.
You may find someone who says. "I have done this with that". But you don't know what their needs are compared to their resources. You need to do the math and then you'll know.
