I've been asked to cook for a tailgating event where there will be a live fire cooker. For one of the meats I want to smoke a bunch of tri tips to about 115 then sear the heck out of them. I have 1.5 hour drive to the event so trying to figure out best way to smoke them at my house, then keep that 115 fairly steady so when I get to event I can sear them off to 125 or so and rest. Any ideas? I have cambors that I can put them in but worried that temp would drop quite a bit. Might be over thinking this, but want to make sure I get the cook right.