Looking at your last picture, now I can completely understand why you wanted the larger legs. If you filled it to capacity, there would be a lot of weight in there.
Do you find, having the WSM on wheels, that the unit is topheavy and more apt to tip? Did you order the middle section from Weber? If so, was it more expensive than buying a stacker unit? Sorry to throw all these questions at you, but I like the wheel mod and would consider doing it myself. Plus, with family reunions and cooking for larger crowds at work, I have been considering the stacker unit. I usually end up taking 3 OTGs to the event and keeping them all going.
This will be the first time taking the WSM.