Climbing protective gear is only as good as its placement. A well placed cam that's weighted continuously is unlikely to walk, but that means finding a good placement. If you're only carrying a handful of cams, finding an appropriate placement (or two!) is going to be a lot tougher. It's also going to depend heavily on the type of rock formations in the area where you're climbing.
One option to consider would be Omega Pacific Link Cams - these are a more elaborate cam, which has a larger expansion range than a traditional friend.
http://www.omegapac.com/product207.html
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