score:5
Are rental cars geared up for this kind of driving? Winter tires?
Rental cars are heavily geared towards tourists and are designed to be taken to well known tourist sites on the main road network. Rental companies will have seasonally appropriate tires.
Will I need a 4x4 or SUV, or might a regular car work?
Most of the Icelandic population drives compact cars and 4x4s (especially the heavy duty ones) are disproportionately used by tourists. Most of the highways are traversable by compact car. (Assuming the road is open and not immediately after a snowfall. F roads are an exception which are more like rural tracks as opposed to highways). However, in many cases the small segment of road connecting the main highway to a tourist site such as a waterfall or viewpoint would be difficult in a non-4x4. (Example the road to reach DyrhΓ³laey Lighthouse.) That being said, I don't recall any such segments on the Golden Circle.
Will there be help available if required? e.g. I plan to drive the well-travelled golden circle round. Guessing there will be lots of traffic on this route.
Yes. Plenty of Icelandic people live in/near the Golden Circle and the route is well traveled by tourists and locals alike. My recollection is that cell service is reasonably good there as well. This isn't the case with all common tourist attractions. Dettifoss or the ring road between HΓΆfn and DjΓΊpivogur is quite far from any local population.
Are there "gotchas" with getting a rental car and driving this route this time of year?
Not really.