The probes come with clips that attach to the grill or you insert them into the meat...I do one of surface temp and other for large cut of meat. 2 probes can fit in each hole with no issues so you could do one heat probe on each rack and one in two pieces of meat.
"If you were to pour one full stack of unlit briquettes around the triangle, and add the lit ones as you describe, how many hours of unattended cooking would you expect to get? By "unattended", I simply mean not having to add more briquettes. I think a WSM would suit me and wife, fine. "
I put 1/2 bag in my last cook roughly 8 pounds which filled it almost level with bricks then used 1/2 chimney lit. I only added wood and when I took off the brisket I cooked beans for 2 more hours for a total of 13+ hours. My modifications probably help slightly especially with the seal.
"If you were to pour one full stack of unlit briquettes around the triangle, and add the lit ones as you describe, how many hours of unattended cooking would you expect to get? By "unattended", I simply mean not having to add more briquettes. I think a WSM would suit me and wife, fine. "
I put 1/2 bag in my last cook roughly 8 pounds which filled it almost level with bricks then used 1/2 chimney lit. I only added wood and when I took off the brisket I cooked beans for 2 more hours for a total of 13+ hours. My modifications probably help slightly especially with the seal.