Don, I use these on my truck: Lock-On Guard - Locking Fuel Caps - Stop Fuel Theft - Fuel Theft Devices - Freightliner Semi Truck Lock-On Guard Gas Cap Device
I really like them and think they work well. I got them because I'm more worried about somebody putting something in the tank to sabatoge it than I am about theft.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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