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FYI, Powerlet recommends you not use the Battery Tender pigtail. They have a coaxial pigtail that I have on all my bikes. Then I use a coax to SAE adapter for the tender to charge the batteries.
Had Widder for years, when it gave up the ghost I got Powerlet, with the wireless controller. No complaints, but I have comparison with the other two. On a related note, First Gear sells a panel-mount coax socket that could be used for any of the coax-based connections (maybe all of the above?). Beats the hell outta having a dangling coax lead.http://firstgear-usa.com/6-dc-coax-jack-panel-mount.html
As of two or three years ago, Gerbings are under new management. They no longer honor the lifetime warranties of products purchased prior to the change of ownership without having original proof of purchase.
You don't leave the wireless controller in a pocket. It will get turned on/off by accident. Get some heavy duty velcro and stick it somewhere within reach on each bike.
Wireless? Lots of amperage through the air?