I come from a ultralight backpacking/bikepacking background, so it's honestly no big deal for me to delay cooking around the weather. Carrying this much cooking gear/food and having a space that is truly enclosable and climate controlled (with a DVD player!) is, in itself, a luxury

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My table was installed in September of 2021 (nearly 4 years ago) and I've experienced exactly zero downpours during a cooking event. I don't disagree that a liftgate would be preferable in a downpour, but for my application, the packaging/usability benefits of the barn door and door-mounted table vastly outweigh the risk of being inconvenienced or, at the worst, going to bed hungry due to a weather event.
I also agree on the note of a dual swingout for providing some more room, however they also add quite a bit of weight to the rear of the rig. My table weighs less than 10 pounds, and my drawers only weigh 70 pounds. Swingout bumpers or drawers with an extended cooking platform are going to weigh hundreds of pounds. I suppose a batwing awning would be the best of all worlds, yet they are also heavy and expensive.