I beleive there is an option for a Cab heater. I even think there is a guy that has a brand new one for sale on this forum.
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2007.5; 6.7;6 speed auto; Laramie; Mega Cab;4X4;3500;Tekonsha P3;Pullrite 24k;Ride Rite bags;Bridgestone Dueler AT REVO 265 70 17; Stock.
2008 Heartland Razor 3212sb