What do you intend to pump with the air system besides your tires? Inflatable boats, kayaks, tires, bouncing castles, etc., are typical examples. A small onboard unit will do the trick if you want to use it for smaller tasks while a more heavy-duty air system is required if you want to use it for multiple purposes.
The size of the compressor is essential. You don't want to get one that is grossly underpowered for the tasks. Likewise, you won't like something so big and bulky that it’s an overkill. Compressor ratings are typically given in cubic feet per minute (CFM). This is the volume of air that the compressor can push in a minute. Consider the PSI rating and the tank size too.
The deflation feature comes in handy now when you need to deflate your tires or another inflatable object manually. You can save a few minutes, but it shouldn't be a deal-breaker.
Installation is pretty straightforward for most onboard air systems, but getting a professional to do it is always a good idea. Most of the onboard air systems on the market have installation videos on YouTube. Ensure you have all the tools and hardware before you start. Also, you should consider durability and warranty.
As you browse through our onboard air compressor systems, you'll find some superb air compressors on the market that won't break the bank. Just keep the factors we mentioned above in mind.