Future Automation for the mount. Probably a PS55 or the next size up, with the bar kit. They're a bit pricey as far as mounts go, but it absolutely makes moving the TV around a non-issue.

Just went through this with a 75" Samsung Terrace TV with the speaker bar, which is a pretty porky combo. The Samsung companion mount is a weird piece, and I didn't see any way to adjust it to keep it from sagging. And even if I could, it didn't pull out far enough to get to the stuff behind the TV, which was mounted up high. We swapped in the Future Automation mount and it looked awesome and made service super easy.