Wireless Client Disconnecting when swapping APs

We have semi-recently deployed a handful of Cisco AIR-AP1141N-A-K9 access points in our warehouse.  They are all configured as stand-alone APs, on non-overlapping channels.  They are all connected to the same LAN, and are configured with the same SSID settings.

We are able to connect to all of them, I have walked around with my phone ( <3 WiFi Analyzer) and can swap between them with no issues.

The trouble we are having is with the forktrucks.  Each truck has a PC mounted to it, utilizing WiFi to connect to the network.  These trucks run our Warehouse Management and Enterprise Resource Management software to track stock movements.  The specific problem is two pronged.  

The first symptom is the client-server based software disconnects, requiring a restart of the software, loosing all work-in-progress.

The second symptom is the trucks will eventually just give up on wifi, and refuse to connect to anything.  This has lasted for up to an hour.  Usually, by the time the driver parks, gets off the truck to make note of it, it has fixed itself (~5m).  Occasionally, it requires a system reboot before it will reconnect.

I have tried using a wireless bridge mounted to the outside of the trucks to attempt for any signal attenuation from the safety cage.  I have tried using the internal card (PRISM chipset).  I have tried using a Belkin USB Wifi adapter (broadcom chip).  All to no improvement.  

Is the correct answer to this problem a Cisco WLAN Controller?  Will that prevent the disconnect/reconnect issue?   Could I have too much overlap in my networks, causing the clients to hop between too many SSIDs in too short of a time?

Looking for suggestions - this has been plaguing us for months.

Thank you!
tholmanAsked:
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Craig BeckCommented:
Can you post the config from one of the APs?
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tholmanAuthor Commented:
Please see attached file.
config.txt
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tholmanAuthor Commented:
I will read through this tonight.  Any section in particular I should focus on?
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Craig BeckCommented:
Start here...

http://www.cisco.com/en/US/docs/wireless/access_point/12.2_15_JA/configuration/guide/s15roamg.html#wp1051848

Go as far as the 'Enabling Layer 3 Mobility on an SSID' section.
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