The Pacific Northwest Section does their tri-level (One Doubles) league as individual playing levels for men and women -- 3.0, 3.5, 4.0, 4.5. The teams are minimum 2 players, max 6 players. Each team match is just one doubles. This solves the problem of having to build a team with players at all playing levels.
The 3.5 - 4.5 men & women teams that win at sectionals go to Indian Wells representing the Section.