As for the gas sign, even on the interstates in the west, they can be a very long ways apart. I know of a stretch on I-80 where they are 80 miles apart.
John Deere 4310 CUT, Ford New Holland 575E Industrial Backhoe, John Deere F725 Front Mount Mower
I have two of those vent clip mounts I bought off eBay that are worthless.
I have one I bought off the rack at a Loves truck stop that I used to hold my phone and gather GPS data while running a track day on the Daytona Road Course that held the phone with no problem.
I like the Nato mount for my phone, have a couple in truck, couple in Tahoe (for both driver and passenger). They have wireless charging version also for phones that support that.