My rig is plugged in all the time so I just plug the Battery Tender Jr. into an AC outlet over the cab. The wires that come with the Tender are quite long. I edited my previous post several times so go back a couple of postings to make sure you get my latest info. I also have a four way splitter so I can add other stuff to my power point plug such as chargers and GPS.
2015 Greyhawk 29MV
Honda CRV toad with Blue Ox baseplate
Ready Brute Elite towbar with braking system
TST 507 Flowthru TPMS