Certainly guy lines will help, but the true test of a mountain tent is how well it stands up to high winds. A backyard rain test is not a good indicator of how well any tent will perform in the high Sierras. You'd be much better off getting a tried and proven tent from a manufacturer of real mountain tents, not Walmart or Sears, and the like.
Go to a local mountain shop, like REI, or another, and ask their advice.
Last edited by Bob West; 11/09/14 06:19 AM.
