Reed, I am going to break down and get a decent compressor someday soon -- I had one of those Harbor Freight things that essentially melted the first time we used it. (And this was not their cheapest model -- this cost almost a hundred dollars.)
So since then I have always traveled with a really good (wait for it . . . . ) bicycle pump! And guess what -- it really works. I had a slow leak in one of my truck tires a few years ago -- the bike pump did the job. It took ten minutes every morning to raise the tire pressure from 45 to 50.
But I am the first to admit that this is not a viable solution -- it's a band-aid. Great exercise, though.