I have a battery tender pig tail on everything. My 2018 "ST" wing has one at the rear hole in the side cover as well as one through the seat (easy use for passenger heated gear and phone charging while riding). My 2010 has one in the left trunk corner pocket (also for passenger heat & charging) and the cord can easily run out of the pocket behind the door on the lower outside corner. My M50 ust sticks out from under the side cover because there is not a good place to tuck it out of sight. My car has one coming out of the grill near the battery and anchored down inside to not rip off or break the grill if I forget to unplug it and drive away. My Tailwind has a connector plug and wire that I use inside to connect the "lighter outlet" directly to the always hot accessory wire in the trailer lights wiring and another adapter at the tongue for my 6 square trailer plug to the SAE 2 wire tender plug. Trailer and car stay plugged into Tender until used. The Tender for the wings switch back and forth according to which one was not last ridden and M50 has a 1.5w solar always plugged in. I tried to use the solar on my car, but with alarm being armed, it only extends battery life of non-use from a month to 2 or three months. I use one of the solar ones on the trailer when on the road and trailer sits for a while. Also, all of my solar chargers have been correctly wired to not blow fuses and/or kill the batter because they are all wired backwards with the battery + having the exposed side of the plug.