For safety concerns, next time take it off the the propane smoker and put it in the oven. There is not much difference. If you want to add more smoke put it back on the smoker when you get home. I understand you are trying to get smoke flavor on the meat but this would eliminate leaving a smoker unattended.
Glad to hear that everything turned out okay.
Team: Pyle's BBQ; Yoder YS640; Good-One "Trail Boss" 60T; Weber Kettle w/rotisserie ring; Big A$$ Rotisserie; Weber OTS; New Braunfels offset smoker.
Saddles BBQ Bistro