Best practices, tips, and tools for racking heavy-ass network gear (when working solo)?

Racking a lightweight 24-port PoE switch or a patch panel is easy enough, but trying to mount a 50lb core switch, a heavy enterprise router, or a massive UPS by yourself can be a nightmare and turns into a two-person job quickly.

Any weird DIY rigs, specific rack shelf models, or mounting tricks you use when you're stuck doing an install alone in a remote location?