Verdi is home to two of the closest Nevada casinos and RV parks to California on I-80: Terrible's Gold Ranch Casino, now known simply as Gold Ranch Casino, at Exit 2 and the Boomtown Reno at Exit 4. Nearby is the closest Cabela's to California.
Optus / Vodafone do share, but they are going their own ways. However new towers may still be built for both. Vodafone / Telstra have roaming capabilities using Telstra towers in some areas Hutchinson (3) / Vodafone have some shared towers Telstra / Hutchinson share towers
Buildings, trees, hills, mountains, etc. all diminish a tower's transmission distance. Cell phones use regular line of sight radio signals. The more stuff that is in that line of sight between you and the tower, the less signal that gets through. You can't have cell sites running at 300+ watts and get better coverage. This is fine for a one-way device like a beeper because your beeper doesn't have to transmit back.