Not all laptops have decent wireless capabilities. We have three types at work, one will only sniff 3 AP's at a time, the Dells will sniff over 10 at any one time as the cards/aerials are better. It's possible the Caravan was also affecting the signal getting through to some users. It might be worth considering setting up two AP's at different locations to spread the amount of users on the system, the more users on the AP the more stressed it will become and cause possible dropouts, etc.
As a last thought it might be worth trying a different wireless channel.
1, 6 and 11 are the standards.
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