Make it clear you're not just benefiting ten people in Two-Dot, Montana, but that you're solving a problem shared by all rural schools and are creating a replicable national model. A specific strategy for broadly sharing your solution should be specifically part of your proposal plan. Choose your partners wisely. The more partners you have to deal with, the harder it is to keep everyone happy, particularly where control of large sums of money is the issue. If you plan to be working with your grant partners for years, you'd better be sure you know who you can trust and work with.
Many projects end up with internal in-fighting that takes the fun out of getting funded.
Money changes friendships. Consider whom you may have to work with if you get funded and whether you should include them for a share of the funding to avoid future resistance to your project. Grant reviewers look closely to see who is flying solo, and who works well with the other girls and boys. The better partners you have, the safer their money is when invested in your project. Even if your first grant-writing effort doesn't get funded, the planning and writing process still allows you to resubmit your idea elsewhere.