Take a look at this: New Portable Computer and GPS System (from IH8Mud)
It's a different option than what you stated in your first post but appears to meet all the requirements you set.
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Lance
2001 4Runner Limited 4X4 -- 315/75R16 MT/Rs | MT Classic IIs | Dual ARBs/4.88s | (F) 5125/Tundra Coils (R) 5125/LC Coils | 4Crawler 1.5" BL | Aisin Manual Hubs | Slee Sliders | Sonoran Steel Rear Bumper | TJM T-15 w/ Warn M8000
2004 Land Cruiser -- OME Medium Lift | Nitto Terra Grapplers
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