said by frankie j:wireless ap which says it can hold 500 users and seeing that i have a 500 dollar cisco router that is capable of 100 users with out being wayed down this is not an issue i dont think
No single 802.11 router will handle 500 customers. That's pure BS. Don't believe anything the marketing people print on stuff.
The most you'll ever be able to connect without major issues would probably be 25 to 50, and that's assuming they all have excellent signal. Just one or two people with bad signal can ruin the throughput for EVERYONE else connected to the access point. The throughput of the entire AP may drop to only a few megs.
That's why most of us here require an externally installed antenna that has much better line of sight to the AP. The signals don't change as they move around their trailer since they will have their own wireless router inside the trailer if they want to use their own wireless devices.
Once you start letting people connect to an AP at that range, you will probably find that you won't have much capacity, and it will be difficult (if not impossible) to offer any reliable level of service.