Posting problem again.
Well, I don't know how useful it's going to be but, I went out a measured my charcoal grate and it's 17 inches BUT I have a
Weber One-Touch-Gold (OTG) 22.5 so I don't know if that's the right size grate for an 18.5. What I wanted to say is yes, I use two grates, at right angles to each other and man does that solve that problem. I have to smile at your confusion about overkill...... Let's see, I have a Big Block GOSM which has been frankensized to run on charcoal as well as propane, a Master Forge Propane smoker, a 5 burner Ducane grill (with side burner for the rotisserrie ((and that is nice))), 2 tailgate size propane grills. THEN, forluvofsmoke, Eric twisted my arm to going to a Weber OTG, just had to get the 22.5 for the charcoal catcher underneath, that is sweet too. Found out from Todd about a Smoke EZ adapter for the OTG that lets me use the OTG like a WSM. Then I just had to have the Rotisserrie adapter for the Weber grill and of course I found some cast iron grates for the Weber (also available in 18 in if you're interested). I've had the Rib-o-later for a while and it works just fine with the rotisserrie adapter. And, I'm reviewing several of the plans of our members who've built a plywood smoker for sausages and the like. Now, what was your question? Oh yeah, overkill!!!! Not in my book.
Have a good one
I just noticed that my posting problem includes that when I do a quote, my additional remarks don't always follow along in the submit. Let's see if this one will work.