These have some pretty good reviews on Amazon and are similar to the Rotopax I havent used either but have been looking onto the Rotopax as well for my build, these are a bit interesting and may try them out the cans are not a whole lot less but the mounts are quite a bit cheaper.
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"The problem with common sense is, its not that common." Mark Twain
1999 F-250SD XCab 4x4 5.4 170k
1998 E-350 LWB (Being converted now) www.DirkMitchell.com