Unfortunately, the roadway infrastructure on Mars hasn’t been updated in decades, so there are lots of rocks and potholes/craters and other obstacles that need to be avoided. You know how those jeeps go out to Moab, Utah and do the 4x4 trails? It’s like that but there’s only one vehicle and no human and 1 hour communication round-trip and if something goes wrong the tow truck is millions of miles and billions of dollars away

The two solar powered ones are decommissioned, both mostly because of diminishing power but one got stuck first. Away from the equator solar power is less effective right? And it's colder, which exacerbates a serious problem: most the energy goes to heating the main components.

The nuclear rovers are doing their assigned missions, and can go about 100m/day IIRC. So, 5000km trek to the pole would take about 50,000 days at 10d/km. Give or take a few thousand km. (It's a whole planet right?)

This is all Wikipedia level research and from memory.

One major issue with transportation in the Martian environment is the extremely abrasive dust and the sharp rocks. Pretty much every rover has had the issue that the wheels deteriorate very quickly and dust gets into every nook and cranny, eventuelly destroying important movement-related mechanisms. As to their movement speed, that's mostly down to the movement being manually commanded and with the light delay of about 20 mins (one-way), you can only command the rover to go so far before involuntarily hitting an object.

The rovers are controlled remotely, so imagine playing a video game where your inputs lag by upwards of 40 minutes and you can't crash.

You really don't want the vehicle to get stuck. Recovery may be impossible.

They have metal wheels that wear out. Even given unlimited power they would no longer be capable of movement after enough wheel/tire wear.