I would be curious as to how much of this current draw is being routed through the existing factory wiring, ignition switch, and so on.
Unless it’s kept independent of the factory electrical system with the use of relays and so on I can see problems brewing with alternator plugs, fusible link ends, or any one of a number of other connections.
The son of a friend of mine got a job babysitting new oil wells some years back and he had a rig like what is mentioned. His dad got real tired of having to go out to some dark oil lease at night with jumper cables to bail the kid out when his boomin’ amp ran the battery down PDQ.