Well if you are serious about parking guard, and living in Cali even if my meager knowledge of US geography tell me Sacramento are upstate Cali, then you should consider the SG9663DR as its main unit cam be hidden out of direct sun, Viofo dont yet have such a model ( dual remote )
If you are parking out of the direct sun, then any camera will be good.
I am assuming the Sg9663DR will handle parking guard better due to no direct sunlight on main unit, but by coincedence i have not been able to test this against similar systems from other brands, last year there was a chance but then it was like summer choose to bypass little Denmark, so did not see any temperatures that would challenge systems in parking guard.
The mentioned SG camera are however only 1080p resolution, but both SG and Viofo are now making dual 1440p cameras in the SG9667DC2K and the Viofo A229 some of us are currently testing, Viofo also have their 4K system but given your location and want to do parking guard it is a hard recommend for me.
The viofo A229 are as you probably know a very new system, i have not yet been able to test mine using the parking guard features, but i think i will be able to install a hard wire kit that would allow for this some time during this weekend.
I am affiliated with SG but the same i can also say about Viofo now, both have sent me free systems to beat on,,,,, i dont do reviews on them as such.
For sure you should get a 2 channel system, it is a must in US 1 plate states ( arnt they all ? ) anyway a rear camera will get a chance on the plate on the back of a on coming car, you should only omit a rear camera if you are under severe financial restraint.