A vehicle-specific mount with a mechanical clamp will; a suction cup on a hot windshield won't. The failure mode is rarely dramatic — mounts sag slowly, then launch the phone on the first hard hit. Look for metal joints, a short arm, and a base that attaches to solid structure rather than flexible trim, and check the clamp's grip every few hundred miles of dirt.

For graded roads, usually; for hard hits, no. Magnets hold static weight fine — it's shock loading that peels a phone off, and off-road driving is nothing but shock loading. If you're attached to the convenience, choose a mount that pairs the magnet with a mechanical lip or clamp, and skip thick cases that add distance between the magnet and the phone.

It can, though it's far more common on motorcycles than in trucks. Sustained high-frequency vibration has been known to wear out optical image stabilization in phone cameras, and long washboard is the closest a truck comes to that. A mount with vibration damping, or one anchored to solid structure on a short arm, keeps the buzz down. Blurry photos after a long dirt season are the warning sign.

A phone, for most people — you already own it, it has GPS onboard, and mounting options are everywhere. A tablet earns its spot when you're following complex routes and want the big map view, but it demands a much stouter mount and a permanent home on the dash. Plenty of rigs run both: tablet for the map, phone for everything else.

If a vehicle-specific mount exists for your truck, buy it. It bolts to solid factory points, holds better, and looks like it came with the vehicle — that's why we push the year, make, and model filter. Universal suction, vent, and cup mounts are the right call for rentals, older vehicles without dedicated options, or a phone that moves between rigs.