I was just thinking of a possible '90%' solution to keeping idle time down, as well as having enough power to keep comfortable in the truck in most situations. Just want your thoughts:
1 - Add a second set of batteries to the truck. I'm thinking about probably 4 1000amp deep cycle.
2 - Add a high-amperage battery isolator
3 - Add a bunk heater (Espar or Webasto) - hooked to Aux batteries
4 - Add fans to the top windows in the sleeper - hooked to Aux batteries
5 - Add a power inverter (1,500-2,500 watt) - hooked to Aux batteries
6 - Run a new power connector for a cooler - hooked to Aux batteries
The battery isolator would allow the truck's alternator to charge both sets of batteries while running. When shut down, the bulk of power pulled from the batteries would be pulled from the auxillary set, leaving the main batteries for starting the engine.
The bunk heater is self-explanatory - keep the truck warm on cold nights. With this setup, you could probably also run a 12v mattress pad or blanket as well, if needed.
The fans in the top windows would be for those times where it's not too hot outside, but the heat just builds up in the truck anyway. Open the front and/or bottom windows to let air in, which the top fans would blow out, sucking the hot air straight out of the truck at the point where the air is the hottest (heat rises, after all).
The power inverter would be for a microwave, coffee maker, whatever.
I'm thinking that total cost on this setup would be in the $1,200-1,500 range, with the bulk of the cost being the bunk heater. Installation could be done by an average mechanic, just as long as they understand the need for high-amp cables and such.
I'm thinking that a setup like this would allow for 15-20 hours of 'draw' from the aux batteries before they required the truck to be started for a recharge. Also, if the temps are below, say, 80 degrees, you shouldn't have any problem staying somewhat comfortable, even in direct sunlight.
So - what ya think? Sound like a workable idea?