I have carried a tire inflator for many years, and they are so old that I doubt you could buy them now. I have never had any problem with them, and they still work today even though they are several decades old.
The off road crowd (Toyota 4Runners) usually carry an large air compressor, for they need to deflate tires with going on sand, and reinflate them when going back to the highway. ARB air compressors seem to be the brand of choice:
On-Board Air Compressors These large air compressors need to be hardwired to the battery, for they need more current than is available in the 12 volt outlets (cigarette lighter).
Another option you may want to consider is an air tank (
Amazon.com : air tanks portable). You can fill them up at your gas station. There are no moving parts to wear out and they keep the pressure for months. Yes, they do take up more space. I also have an air tank that I have had for years, again with no problem.