also most covers can open up in the middle if the temp does start to climb
Not factory ones!
I wouldnt be overly concerned with having one. I ran my truck one winter without and saw regular temps of -35c and never saw much difference only on warm up does it make a huge difference i found. Going down the highway in winter or summer my temp stays pretty much the same.
Mike L Stage Awesome!
Airdog2 165, 5" MBRP Turbo back
EFI Live tuned by Idaho Rob, DSP5, ATP
Cognito set at 8" Nor-cal Truck
Fox 2.0 shocks all around, Deaver 6" springs
SS idler support/ Rare parts tie rods
37x13.50x20" toyo MT's/ XD Hoss wheels, Fuel Octanes
HID's All on mod/ AMP reaserch steps