It's that time of year to think of heat.
I have 2005 Fleetwood Excursion 39S DP, Cat C7, Allison, and two furnaces. While traveling during the winter months the heater (running off of the engine hot water) up front heats that area nicely....
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There is no reason not to if you feel the need. They make them compete with integrated fan. If your water heater has the fittings you can plumb it in also and the engine will heat that too.
