18.5" WSM nests inside the UDS. I cut the bolts that hold the UDS's grates to just the right amount of clearance. I put those rubber/plastic screw covers on the bolt ends to protect the WSM. A towel goes over where the WSM's lid sits, the lid goes into/on the towel upside down and then the lid closes on the UDS holding the WSM together inside it. Two bags of charcoal, one on each rear floor board. Two big black boxes in the rear seat - one with "outside stuff" (think extension cords, light, smoker supplies), one with foil, gloves, etc. The grates for the smokers go in a heavy duty black garbage bag on the box behind the driver's seat. Fold in half 6 foot table in the trunk first, two coolers on top of that (red cooler has raw meat on the way there and is our "hot box" when we need to rest big meats later; blue cooler is for drinks, injections, etc.), tool box with knives, rubs, etc. goes behind the coolers. Case of beer to the passenger side of the trunk. Change of clothes, toiletries and directions in the passenger seat. Done! Todd from Bark Bros. said it best - "Wow! You run lean and mean!"