I’m fine with keeping equipment in the rack if its secured, but I always remove the cabling. I personally don’t think people pay much attention to that part.

I’d also put packing between devices. Since its all going in the uhaul, I wouldn’t personally feel the need to separate anything out of the rack, I’d probably leave it in and just check all my mounts are secure. I’d also make sure the rack is secured well in the uhaul, strapped in with a blanket between it and the wall.