My RK is still over at my brother's house, so I can't check myself, but measure the width between the rear wheels. I have a mini van and can move it without breaking it all the way down. I take off the top then remove the cooking and charcoal grates to reduce weight. With that done, I can lift the cart/frame and lower bowl and get it into the back of the van. Once all 4 wheels are in the van, I put the grates back in and then slide the RK a little further in. This gives me room to angle the lid in and set it on top.
If you find that you do have to break it down, the bowl attaches to the frame with 2 bolts through each leg, for a total of 8 bolts. You would also need to remove the lid bale from the lower bowl. The bale is connected to the support arm, which itself is attached to the rear axle, but you should be able to just lay the bale and support arm down once removed from the bowl. If you find that you have to break the cart down, it's one more bolt and you'd also need to remove the 2 cap nuts to take the axle out. It's kind of a pain to do that without destroying them. But, you can replace them for $3 or less, so not a big deal if you know in advance and already have new caps available.