Interesting. Does your Chuckwagon have the built in baffle? I borrowed my brother's convection plate to see how it would fit in my smoker. It was a perfect fit. I have heard the convection plates are hit or miss and don't always fit. I would have some tuning plates made.
OK Joe's Longhorn & Vertical Roasting Oven, Brinkmann Cimmaron,'69,'73,'84,'89 Weber Kettle