I have the ViaAir as well and it's amazing... but I never use it. It's a big kit that will do ANYTHING. But... it's also a big kit.
Last year I picked up this Dewalt portable inflator:
I'm not a shill for them or anything but am definitely in love with it myself. I keep it in my truck rather than my camper and we use it for everything - tires (160psi max so it'll do a camper tire), sports balls, air mattresses, an inflatable boat that we bring sometimes, and even blowing out the lines when winterizing.
It runs off a battery and since I have other Dewalt tools I can also run a flashlight head or my driver off the same battery. So I always have an extra charged battery handy somewhere. But if I don't, it can also run off 120VAC or 12VDC. (Note that a common complaint is if you want to run it off 120V the cord for that is sold separately, so make sure you get it if you care.)
I would say the ViaAir 450 is a much faster / more powerful inflator. But it's also pretty expensive and bulky, and only does that one thing well. If you want a more compact and flexible option, the Dewalt is worth a look.