So right now I have both my Bradley smoker smoking two butts and I have the Traeger going smoking ribs. I have both plugged into the same outlet using a power strip.
What I have found is that when the Bradley heating element is on the fan on the Traeger changes pitch slightly(slows a little). As the butts have progressed through the stall the Bradley PID is activating the heating element more often. This has caused the PID on my Traeger to work harder trying to keep the temp even(due to fan speed fluctuation). I had to re-adjust the OUTHL to compensate for this. I am seeing more swings than usual because of this but nothing to worry about. The PID is doing a pretty good job under the circumstances ;)
It is not often that I have them going at the same time but it is something to consider. Just thought I would pass the info along :)