For those who may find this thread later, ddawg16 was referencing "Starting down the big hill
I've also discussed with my excavator, and will be installing a 2" schedule 40 conduit alongside the 7.2kV main from the POCO. The minimum the local TELCO allows is 1.25" (per my excavator). I've gone larger to allow room for a future fiber pull (which may replace the phone line entirely). I'll be installing a single junction box near my front gate so I can install a gate camera, breaking my run into ~600ft and ~100ft.
Some other interesting things I've compiled from the local POCO, TELCO, and contractors:
1) Consider filling the trench with sand if your ground is too rocky (ours is) and you're close to a driveway - this minimizes the risk you may sever a cable with a rock if heavy equipment rolls over it.
2) Separation from the power company is only 12", horizontal or vertical. My excavator will lay both cables side by side.
3) TELCO engineering in our area (Centurylink) won't help with any technical work and/or conduit recommendation until you're 90 days from installing the final service. We had to speak with local excavators and builders to size the conduit.