Gonzo42 wrote:
Just make sure your +12V line can feed 15 amps, or your compressor will burn up. Don't ask me how I know.
That is just the problem. Supplying enough amps AT PROPER VOLTAGE from coach battery through fuse, wiring, plug and wiring in toad is at best very difficult, more probably not practical.
That is why using the toad battery to power the amps (and it will be at proper voltage since the wire run is a couple of feet, not many yards) and have the charge line recharge the toad battery all the time the coach engine is on/all the time the toad is plugged in (depends on how you wire the coach feed).