Since a new truck probably isn't in my future till the spring but another dog is we need a way to transport 2 big dogs. I have a topper lying around that should fit my truck so atleast they would be out of the wind but the air would still be freezing in the UP winters. I'm thinking it would be pretty easy to find a nice big heater core in the junk yard and maybe a blower motor, T into the heater lines with a valve some where easy to get to so i can turn it on or off, run run some heater hose to the back of the truck. Would this plan make my truck run too cool not giving me no heat? Would a different temp t-stat make a differance? Also any ideas for insulating the topper?