So i've seen this system at the local stores, and actually know a few people with them. I guess it mounts under the vehicle and runs a small enough current to detour any rust. Considering this system costs about $300-$400 for a SUV size, and it costs under $100 for a cheap undercoating, it will take a long time for it to pay for itself. Do you guys ever use these (on your jeep, or anything else)? Any opinions?

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02 KJ "Frank The Turtle"
http://www.cardomain.com/ride/3111598

No Thanks.

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks

wouldn't use it, mines been through 4 Ohio winters with lots of slat etc and no rust yet

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Sounds like snake oil to me. Without knowing any details, I would be highly skeptical. Consider that your entire vehicle always has current running through it. You chassis is the ground return to the battery. It's low voltage, high current.
Rescu2000

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2003 Liberty Sport 4X4
DIY Frankie Lift, BBS Rims, Aussie Locker Rear, DTT Front, Renegade Rack & Light Bar, Custom Front Bumper w/ Warn XD9000i, Custom Rear Bumper, JBA UCA's, Full Skids(Mopar, Kilby and Super skid), CRS Rock Rails, CB, EVIC, Nav, power dim mirror, (2) 8" subs under front seats. http://www.cardomain.com/ride/2512777

Just spray it off often.. I bet my entire unbody looks better than anyone elses.. Maybe even a new vehicle.

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster

That's not what she said!