Have you tried running it on acc mode? Was planning to do a slow cook but if I gotta run the truck for 8 hours might just throw that idea out the windowI run my tailgater off the outlet in the cab. Works fine for me. Only issue is I have to run the truck to keep it on. It times out after so long if not In run mode.
The biggest draw is from the initial burn. I put a quarter inch of pellets into the hopper and light it with a propane torch. Then I plug my Traeger Ranger into an inverter connected directly to my battery. Barely any power is needed to run the fan and auger. Smoked a pork loin 4 hours the other weekend this way, never had to start my Gladiator.
I just bought the GMG Trek this weekend. So far so good (bacon and a long pulled pork cook), but I've only run it in AC mode so far, so can't comment on running it off of the Jeep yet.GMG has 12v smokers